When most people think about choosing a bit, they focus on whether it's a snaffle, pelham, or some other type - essentially, the cheekpieces. However, the mouthpiece - the part that actually sits in your horse's mouth - is arguably even more important to your horse's comfort and response.

The mouthpiece determines where and how pressure is applied in your horse's mouth, how the bit affects the tongue, bars, palate, and lips, and ultimately how comfortable your horse will be accepting contact and working with you. Two bits might have identical cheekpieces but completely different mouthpieces, creating entirely different experiences for the horse.

At The Fitted Horse, we see the transformative effect of correct mouthpiece selection regularly during bit fitting consultations. A horse who has been resistant, tense, or unhappy in one mouthpiece design can become soft, willing, and comfortable when switched to a more appropriate option - even if everything else about the bit remains the same.

Understanding mouthpieces - how they work, what they do, and which suits your horse's individual mouth conformation and sensitivity - is essential for creating genuine comfort and effective communication.

In this comprehensive guide, we'll explore the most common mouthpiece designs, discuss how each affects pressure distribution and bit action, outline the pros and cons of different options, and help you make informed decisions about what might work best for your horse's specific needs.

Understanding Mouthpiece Anatomy and Pressure Points

Before we examine specific mouthpiece designs, it's important to understand the anatomy of the horse's mouth and where bits create pressure.

Key Pressure Points in the Horse's Mouth:

1. The Tongue: The tongue is incredibly sensitive, packed with nerve endings, and essential for swallowing, balance, and comfort. It's also the largest structure in the mouth, taking up significant space. Most mouthpieces create some degree of tongue pressure.

2. The Bars: The bars are the gaps in the horse's dental arcade between the incisors and molars where the bit sits. This area has relatively thin tissue over bone, making it sensitive to pressure. The bars are where we ideally want most bit pressure to be directed.

3. The Palate (Roof of the Mouth): The hard palate is the bony roof of the mouth. Some mouthpieces can create pressure here, particularly if they're too thick for the horse's mouth or have significant nutcracker action.

4. The Lips and Corners of the Mouth: The sensitive tissue at the corners of the mouth can be pinched, rubbed, or pressured depending on mouthpiece and cheekpiece design.

5. The Jaw and TMJ (Temporomandibular Joint): Whilst not directly contacted by the mouthpiece, bit pressure can affect jaw movement and the TMJ, potentially creating tension throughout the horse's entire body.

How Mouthpieces Distribute Pressure:

Different mouthpiece designs distribute pressure across these points in different ways:

• Single-jointed mouthpieces create a nutcracker action, applying pressure to the tongue (downward) and the palate (upward) when reins are engaged
• Double-jointed mouthpieces reduce the nutcracker action, typically creating less palate pressure and different tongue pressure patterns
• Straight or mullen mouth pieces create even pressure across the tongue and bars without the nutcracker effect
• Ported mouthpieces reduce tongue pressure by creating space for the tongue whilst directing pressure to the bars

The "right" mouthpiece distributes pressure in a way that your individual horse finds comfortable and to which they can respond willingly.

Single-Jointed Mouthpieces: The Traditional Choice

Single-jointed mouthpieces feature two arms connected by a single joint in the centre, creating the classic snaffle design that most riders are familiar with.

How It Works:

When the reins are engaged, the two arms of the mouthpiece fold upward at the joint, creating a "nutcracker" action. This simultaneously:

• Applies downward pressure on the tongue
• Can apply upward pressure on the palate (roof of mouth)
• Creates pressure on the bars

The degree of this action depends on the angle of the joint, the thickness of the mouthpiece, and how much space is available in the horse's mouth.

Key Characteristics:

• Nutcracker action: Moderate to significant depending on design
• Tongue pressure: High when reins engaged
• Palate pressure: Possible, especially in horses with low palates or thick tongues
• Bar pressure: Moderate
• Independence of sides: Very high - each side can move completely independently

Pros of Single-Jointed Mouthpieces:

1. Maximum Lateral Independence: Each side of the bit can move completely independently, providing very clear, direct lateral aids. Excellent for precise steering and lateral work.

2. Traditional and Widely Understood: Single-jointed snaffles have been used for centuries. Most trainers, instructors, and riders understand how they work and how to use them effectively.

3. Simple and Straightforward: The action is uncomplicated - what you do with your hand translates directly to the bit's action. No complex mechanisms or multiple pressure points to consider.

4. Widely Available: Available in virtually every material, cheekpiece type, and price point. Easy to find and replace.

5. Competition Legal: Accepted in all disciplines at all levels without question.

6. Can Be Very Effective: For horses with the right mouth conformation (high palate, thin tongue, adequate space), single-jointed mouthpieces can work beautifully.

7. Encourages Forward: The tongue pressure can encourage horses to move forward away from the pressure rather than backing off or getting behind the bit.

Cons of Single-Jointed Mouthpieces:

1. Nutcracker Action: The folding action can create significant pressure on both tongue and palate, which many horses find uncomfortable.

2. Potential Palate Pressure: In horses with low palates, thick tongues, or small mouths, the upward pressure on the palate can be quite severe and painful.

3. High Tongue Pressure: The joint creates a point of concentrated pressure on the tongue, which an increasing number of horses seem to find uncomfortable. (See our comprehensive tongue pressure guide for more detail on this growing issue.)

4. Can Create Evasions: Horses uncomfortable with the tongue or palate pressure often develop evasions:

• Opening the mouth
• Crossing the jaw
• Putting the tongue over the bit
• Getting behind the bit
• Head tossing or tilting

5. Less Suitable for Sensitive Mouths: Horses with very sensitive mouths, thin tongues, or low palates often struggle with single-jointed designs.

6. Sharp Point Potential: The angle created when the joint folds can be quite severe, creating what feels like a sharp point in the mouth.

Best For:

• Horses with high palates and thin tongues
• Horses with adequate space in their mouths
• Traditional training contexts where single-jointed bits are standard
• Horses who haven't shown any signs of discomfort with this design
• Situations requiring maximum lateral independence
• Horses who respond well to clear, direct tongue pressure

When to Reconsider:

If your horse shows any of these signs, a single-jointed mouthpiece may not be ideal:

• Opening mouth or crossing jaw
• Tongue over the bit
• Head tossing, particularly in transitions
• Resistance to contact
• Getting behind the bit
• Excessive salivation or very dry mouth
• Tension through poll and jaw

Many of these issues can be resolved simply by changing to a different mouthpiece design that reduces tongue and palate pressure.

Double-Jointed Mouthpieces: The Gentler Alternative

Double-jointed mouthpieces feature two joints with a central link or lozenge, creating a more anatomical shape that generally reduces the nutcracker action.

Types of Centre Pieces:

The centre piece connecting the two joints varies:

Lozenge/Link:

• Flat, curved piece
• Lies across the tongue
• Most common design

French Link:

• Flat, figure-8 or peanut-shaped link
• Two attachment points create independent movement
• Generally considered very gentle

Dr Bristol:

• Flat, rectangular link
• Sits at an angle on the tongue
• Creates more tongue pressure than French link
• Sometimes considered stronger

KK Ultra/Aurigan Lozenge:

• Angled, curved lozenge
• Designed to follow tongue contour
• Sprenger's anatomical design

Roller:

• Central roller (often copper)
• Horse can play with it
• Can encourage mouthing and salivation

How It Works:

When reins are engaged, double-jointed mouthpieces curve rather than fold sharply. This:

• Reduces or eliminates upward palate pressure
• Distributes tongue pressure more evenly
• Creates a more anatomical shape that follows the tongue's contour
• Still applies pressure to bars

The centre piece lies across the tongue, and its shape and position determine the specific pressure pattern.

Key Characteristics:

• Nutcracker action: Minimal to none
• Tongue pressure: Moderate, distributed more evenly
• Palate pressure: Usually minimal or none
• Bar pressure: Moderate to high
• Independence of sides: High (though slightly less than single-jointed)

Pros of Double-Jointed Mouthpieces:

1. Reduces or Eliminates Palate Pressure: The curved action rather than sharp folding means most horses experience little to no palate pressure - a significant comfort improvement for many.

2. More Anatomical Shape: The way the bit curves when engaged follows the natural contour of the tongue and mouth more closely than single-jointed designs.

3. Distributes Tongue Pressure: Rather than a concentrated point of pressure, the tongue pressure is spread across a larger area, making it more comfortable for many horses.

4. Less Severe Action: Generally considered gentler than single-jointed mouthpieces, making them suitable for sensitive horses.

5. Still Provides Good Communication: Despite being gentler, double-jointed bits still provide clear communication and effective aids.

6. Widely Available: Available in many materials, cheekpiece types, and price points.

7. Competition Legal: Accepted in virtually all disciplines.

8. Can Resolve Single-Joint Issues: Many horses who struggle with single-jointed bits work beautifully in double-jointed designs.

Cons of Double-Jointed Mouthpieces:

1. Centre Piece on Tongue: The lozenge or link sits directly on the tongue. Whilst usually comfortable, some horses find this strange or uncomfortable, particularly horses with very thick tongues.

2. Slightly Less Lateral Independence: The centre piece means the two sides aren't completely independent, providing marginally less refined lateral communication than single-jointed designs (though this is rarely a practical issue).

3. Can Still Create Tongue Pressure: Whilst generally less than single-jointed, double-jointed mouthpieces still create tongue pressure that some horses find uncomfortable.

4. Variable Quality: The centre piece design matters significantly. Poorly designed lozenges can be uncomfortable, whilst well-designed anatomical pieces are excellent.

5. Some Confusion About Types: Different centre piece designs (French link vs. Dr Bristol, for example) have quite different actions, which can be confusing for riders.

Best For:

• Horses who show signs of discomfort in single-jointed bits
• Horses with low palates
• Horses with thick tongues
• Sensitive horses
• Most general riding situations
• Young horses learning about bits
• Horses who need gentle but effective communication

Variations and Considerations:

French Link: Generally considered the gentlest double-jointed option. The figure-8 shape allows independent movement whilst lying comfortably on the tongue. Excellent first choice for sensitive horses.

Dr Bristol: Creates more tongue pressure due to the angle of the centre plate. Sometimes chosen for stronger horses, though we generally recommend addressing the cause of "strongness" rather than using more severe bits.

Anatomical Lozenges (KK Ultra, etc.): These shaped lozenges are designed specifically to follow the tongue's contour. Often work beautifully for horses who find standard lozenges uncomfortable.

Roller Centre Pieces: The roller (often copper) can settle mouthy horses and encourage salivation. Good for horses who play with their bits or need encouragement for a wet mouth. (See our mouthpiece materials guide for more on how different materials affect salivation.)

Mullen Mouth (Straight Bar): The Even Pressure Option

Mullen mouth mouthpieces are curved bars without any joints, creating completely even pressure across the tongue and bars.

How It Works:

The curved bar (shaped to accommodate the tongue) sits across the mouth without any hinged action. When reins are engaged:

• Pressure is distributed evenly across the entire width
• No nutcracker action
• No sharp points or concentrated pressure areas
• The tongue and bars receive consistent pressure

Key Characteristics:

• Nutcracker action: None
• Tongue pressure: Even and consistent across entire surface
• Palate pressure: Minimal (unless extremely thick)
• Bar pressure: High and consistent
• Independence of sides: Low - the bit works as a single unit

Pros of Mullen Mouth Mouthpieces:

1. No Nutcracker Action: Complete elimination of the folding action that creates palate and concentrated tongue pressure.

2. No Pinching or Joints: No moving parts means nothing can pinch the tongue or create uncomfortable pressure points.

3. Very Stable: The solid bar provides consistent, unchanging feel. Good for horses who need predictability.

4. Kind to Sensitive Mouths: The even pressure distribution can be very comfortable for horses with sensitive mouths who struggle with jointed bits.

5. Simple and Straightforward: No complex mechanisms - what you feel is what the horse receives.

6. Good for Specific Issues: Can be excellent for horses with very low palates, tongue injuries, or specific sensitivities to jointed bits.

7. No Parts to Wear or Break: The solid construction means no joints to wear out or break.

Cons of Mullen Mouth Mouthpieces:

1. Can Encourage Leaning: The constant, even pressure across the tongue gives horses something solid to lean against. Many horses learn to pull or lean on mullen mouths.

2. Constant Tongue Pressure: Whilst even, the pressure is continuous across the entire tongue. Some horses find this restrictive or uncomfortable. (This is discussed extensively in our tongue pressure blog, where we explain why relieving tongue pressure entirely - rather than just distributing it evenly - is often more beneficial.)

3. Less Refined Lateral Aids: The solid bar means both sides work together. Less precise for lateral work and turning compared to jointed designs.

4. Can Feel "Dead": Some horses find the unchanging, solid feel uninteresting or boring, becoming less responsive.

5. May Inhibit Tongue Movement: The bar across the entire tongue can restrict natural tongue movement needed for swallowing and comfort.

6. Not Self-Correcting: If the bit sits slightly off-centre or crooked, it stays that way - unlike jointed bits which can self-adjust.

7. May Encourage Overbending: Some horses learn to curl behind the vertical to escape the constant pressure.

Best For:

• Horses with very low palates who cannot tolerate any upward pressure
• Horses recovering from tongue injuries
• Horses who specifically cannot tolerate any jointed design
• Some showing or turnout situations
• Temporary use whilst addressing other issues

Important Considerations:

Whilst mullen mouths solve the nutcracker problem, they often create a leaning problem. For horses who need tongue pressure relief, ported mouthpieces (discussed next) often provide a better solution - relieving tongue pressure without creating the constant bar that encourages leaning.

If you're considering a mullen mouth because your horse shows tongue pressure issues, we strongly recommend reading our detailed tongue pressure guide first, as there may be better solutions.

Ported Mouthpieces: The Tongue Relief Specialists

Ported mouthpieces feature a raised section (port) in the centre of the mouthpiece, creating space for the tongue whilst maintaining contact with the bars.

How It Works:

The port - a raised curve or arch in the centre - creates literal space for the tongue to sit comfortably without constant pressure. The sides of the mouthpiece maintain contact with the bars, providing communication whilst relieving the tongue.

Types of Ports:

Low Ports:

• Slight curve creating minimal tongue relief
• Still maintains some tongue contact
• Gentle introduction to ported designs

Medium Ports:

• Clear space for tongue
• Minimal to no tongue contact when rein not engaged
• Most common and versatile

High Ports:

• Significant tongue relief
• No tongue contact in neutral position
• Can contact palate if extremely high (as in some Western curb bits)

Shaped Ports:

• Anatomically designed to follow mouth contours
• Examples: Bombers Happy Tongue, Myler Comfort Snaffle
• Optimised for both tongue relief and bar contact

Key Characteristics:

• Nutcracker action: None
• Tongue pressure: Minimal to none (depending on port height)
• Palate pressure: None (unless port is excessively high)
• Bar pressure: Primary pressure point
• Independence of sides: Moderate (depending on overall design)

Pros of Ported Mouthpieces:

1. Excellent Tongue Relief: The port creates genuine space for the tongue, dramatically reducing or eliminating tongue pressure. This is the primary advantage and why ported bits are transformative for many horses.

2. Prevents Leaning: Unlike mullen mouths which create constant pressure that horses can lean against, ported bits don't provide that solid bar. Horses maintain self-carriage.

3. Maintains Bar Contact: Whilst relieving the tongue, the mouthpiece still contacts the bars, maintaining clear communication and effective aids.

4. Can Resolve Multiple Issues: Horses who show tongue pressure symptoms (opening mouth, tongue over bit, head tossing, etc.) often improve dramatically in ported bits.

5. Encourages Correct Carriage: By removing uncomfortable tongue pressure, horses can relax their jaw, soften their poll, and work in correct carriage naturally.

6. Allows Natural Tongue Function: The tongue can move naturally for swallowing and balance without restriction.

7. Available in Many Designs: From simple low ports to sophisticated anatomical designs like the Bombers Happy Tongue (extensively discussed in our tongue pressure guide).

8. Works Well in Combination: Ported mouthpieces are available with various cheekpiece types (loose ring, eggbutt, hanging cheek, etc.) allowing you to combine tongue relief with the cheekpiece action that suits your horse. (See our cheekpiece guide for more detail.)

Cons of Ported Mouthpieces:

1. Can Be Unfamiliar: Horses accustomed to tongue pressure may initially find the absence of pressure strange and need time to adjust.

2. If Port Too High: Excessively high ports can contact the palate, creating a new problem. Appropriately designed ports avoid this issue.

3. Less Traditional: Whilst increasingly popular, ported snaffles are less traditional than jointed designs. Some trainers or instructors may be unfamiliar with them.

4. Variable Quality: The port design matters enormously. Well-designed anatomical ports (like the Happy Tongue) are excellent; poorly designed ports may not provide the intended benefits.

5. May Require Adjustment Period: Some horses need several sessions to understand the new feel, particularly if transitioning from significant tongue pressure.

6. Can Be More Expensive: Well-designed ported bits, particularly those with anatomical shaping, often cost more than basic jointed snaffles.

Best For:

• Horses showing any signs of tongue pressure discomfort
• Horses who put their tongue over the bit
• Horses who open their mouth or cross their jaw
• Horses who are tense or resistant to contact
• Horses who lean on mullen mouths
• Horses with thick tongues or low palates
• Horses who have tried "everything" without improvement
• Sensitive horses who need pressure relief

The Bombers Happy Tongue: A Case Study

The Bombers Happy Tongue is our most frequently recommended ported mouthpiece because it represents excellent engineering specifically designed for tongue relief without creating new problems.

Key Features:

• Carefully designed port height providing substantial tongue relief without palate contact
• Curved mouthpiece maintaining bar contact for clear communication
• Available in multiple materials (sweet iron, copper, stainless steel) to address different salivation needs
• Available with various cheekpieces (loose ring, eggbutt, hanging cheek, etc.)
• Proven track record of resolving tongue pressure issues

We discuss this bit extensively in our tongue pressure blog because it represents the solution we've seen transform countless horses who were uncomfortable, resistant, or unhappy in traditional bits.

The key principle: relieving tongue pressure entirely, rather than just distributing it more evenly, often provides the best results.

Waterford and Roller Mouthpieces: The Movement Specialists

Waterford and roller mouthpieces feature multiple moving parts designed to discourage leaning and provide constant subtle movement.

Waterford Mouthpieces:

Design:

• Multiple ball-link joints creating an extremely flexible, chain-like mouthpiece
• Constantly moving and shifting
• Impossible to lean on or fix against

How It Works: The many joints mean the bit cannot be stabilised - it's always mobile. Horses cannot establish a fixed point to lean against.

Roller Mouthpieces:

Design:

• Barrel-shaped rollers (usually copper) along the mouthpiece
• Can be rotated by the horse's tongue
• Provides something for mouthy horses to play with

How It Works: The rollers keep the mouth busy, encourage salivation, and provide sensory interest.

Pros of Waterford/Roller Designs:

1. Impossible to Lean On: The constant movement (Waterford) or rolling action makes these bits excellent for horses who habitually lean or pull.

2. Can Settle Mouthy Horses: The rollers give horses something to do with their mouth, which can settle nervous or busy-mouthed horses.

3. Encourages Salivation: The movement and play encourage mouthing and saliva production.

4. Can Improve Self-Carriage: By removing anything solid to lean against, these bits can encourage horses to carry themselves.

5. Different Sensory Experience: The movement and texture can appeal to horses who find standard bits boring or uninteresting.

Cons of Waterford/Roller Designs:

1. Can Be Too Mobile: Some horses find the excessive movement unsettling or distracting rather than beneficial.

2. May Create Anxiety: Nervous horses might become more anxious with the constant shifting sensation.

3. Less Refined Communication: The multiple moving parts create less precise communication than simpler designs.

4. Requires Careful Selection: These bits are very specific in their action - excellent for some horses, terrible for others.

5. Can Be Severe if Misused: Waterfords particularly, if used with harsh hands, can be uncomfortable due to the many pressure points.

6. Higher Maintenance: More moving parts mean more points to inspect for wear and more cleaning required.

Best For:

• Horses who habitually lean or pull (Waterford)
• Very strong horses who fix on more stable bits (Waterford)
• Mouthy or busy-mouthed horses (Rollers)
• Horses who need sensory stimulation (Rollers)
• Experienced riders who understand the specific action

Not Suitable For:

• Nervous or anxious horses
• Horses with sensitive mouths
• Novice riders
• Young horses still learning basics
• Horses who need stability and consistency

Twisted and Serrated Mouthpieces: Understanding "Stronger" Bits

Twisted, wire, and serrated mouthpieces are sometimes marketed as solutions for "strong" horses. It's important to understand these bits and when (if ever) they're appropriate.

Types:

Twisted Wire:

• Wire twisted into a corkscrew shape
• Creates multiple pressure points
• Very severe

Slow Twist:

• Gentle twist in a thicker mouthpiece
• Less severe than wire twist
• Creates slight texture

Square/Serrated:

• Square edges or serrations along the mouthpiece
• Creates uncomfortable pressure points
• Designed to prevent horses leaning

How They Work (or Don't):

These bits are designed to create discomfort that discourages horses from leaning or pulling. They work through pain or threat of pain rather than communication.

Our Position on "Stronger" Bits:

At The Fitted Horse, we rarely (if ever) recommend twisted, wire, or serrated mouthpieces because:

1. They Address Symptoms, Not Causes: A horse who pulls or leans is telling you something:

• The current bit is uncomfortable
• There are training gaps
• The rider's hands or position need work
• The horse is in physical pain
• The horse is anxious or unbalanced

Going to a harsher bit doesn't address any of these root causes.

2. They Can Create Fear and Shutdown: Horses may stop pulling not because they've learnt better balance or carriage, but because they're afraid of the pain. This isn't training - it's suppression.

3. They Can Cause Real Damage: Sharp edges and multiple pressure points can damage the sensitive tissues of the mouth.

4. Better Solutions Exist: In our experience, addressing the actual cause of pulling (often tongue pressure discomfort, as discussed in our tongue pressure guide, or training/riding issues) resolves the problem without harsh bits.

When They Might Be Considered (Rarely):

The only situations where we might discuss these bits:

• Very specific professional training contexts with highly skilled riders
• Temporary use for genuine safety concerns whilst addressing the root cause
• Certain traditional disciplines where they're historically expected

Even then, we encourage exploring all other options first.

Better Alternatives for "Strong" Horses:

If your horse is strong or pulls, consider:

1. Professional bit fitting to ensure current tack isn't causing discomfort
2. Tongue pressure relief through ported mouthpieces (often the solution)
3. Different cheekpieces (loose ring to discourage fixing, hanging cheek for poll pressure)
4. Training assessment to identify and address gaps
5. Veterinary examination to rule out pain
6. Saddle fit check (back pain manifests as pulling)
7. Riding position evaluation (rider balance affects horse's mouth)

Almost always, one of these addresses the issue without resorting to harsh mouthpieces.

Thicker vs. Thinner Mouthpieces: Size Matters

Beyond the specific design, mouthpiece thickness significantly affects comfort and action.

Thicker Mouthpieces (16mm-20mm+):

Advantages:

• Distribute pressure over larger surface area
• Generally gentler and more comfortable
• Particularly good for young or sensitive horses
• Less severe even if pulled on

Disadvantages:

• Can be too large for small mouths
• May create palate pressure if mouth lacks space
• Less precise communication
• Can feel clumsy to sensitive horses

Thinner Mouthpieces (10mm-14mm):

Advantages:

• Take up less room in mouth
• More precise communication
• Better for horses with limited space
• Clearer aids for refined work

Disadvantages:

• Concentrate pressure on smaller area
• Can be more severe if misused
• Less forgiving of rough hands
• Can be uncomfortable for some horses

Finding the Right Thickness:

Consider:

• Mouth size: Small mouths need thinner bits; larger mouths can accommodate thicker
• Palate height: Low palates need thinner bits to avoid contact
• Tongue thickness: Thick tongues need more space
• Sensitivity: Sensitive horses often prefer thicker, gentler options
• Training level: Young horses benefit from thicker, gentler mouthpieces
• Discipline: Some disciplines favour certain thicknesses

General Guidelines:

• Young horses: Start with thicker (16-18mm) for gentleness
• Small mouths: 12-14mm to fit comfortably
• Average mouths: 14-16mm works for most
• Large mouths: 16-20mm can be accommodated
• Refined work: Often 12-14mm for precision

However, these are guidelines only. Professional fitting assesses your specific horse's mouth to determine the optimal thickness.

Mouthpiece Width: Getting the Size Right

Whilst not strictly about mouthpiece design, correct width is crucial for comfort and function.

Too Narrow:

• Creates pinching at the corners
• Applies pressure to sensitive lips
• May cause rubbing and sores
• Horse becomes reluctant to accept bit

Too Wide:

• Slides side to side in mouth
• Creates uneven contact
• May hang crooked
• Can be pulled through mouth

Correct Width:

• Approximately 5mm (¼ inch) wider than the mouth on each side when centred
• Sits comfortably without pinching
• Doesn't slide excessively
• Creates wrinkle or two at corners when first fitted (settling to gentle contact)

How to Measure:

Professional bit fitting includes precise measurement of your horse's mouth width. DIY methods (using string or a dowel) can provide rough estimates but professional assessment ensures accuracy.

Different mouthpiece designs may require slightly different widths even for the same horse, as thickness, shape, and material affect how the bit sits.

How to Decide: Choosing the Right Mouthpiece for Your Horse

With so many options, how do you actually choose? Here's our systematic approach:

Step 1: Assess Your Horse's Current Situation

Observe Current Behaviour: Is your horse:

• Opening their mouth during work?
• Crossing their jaw?
• Putting tongue over the bit?
• Head tossing, particularly in transitions?
• Resistant to contact?
• Getting behind the bit or overbending?
• Tense through the jaw and poll?
• Very dry-mouthed or excessively salivating?

Any of these symptoms suggest the current mouthpiece may not suit your horse's mouth.

Examine Mouth Conformation: Consider:

• Palate height: High palates tolerate jointed bits better; low palates often need ported designs
• Tongue thickness: Thick tongues need more space and often benefit from tongue relief
• Mouth size: Small mouths need thinner, narrower bits; large mouths can accommodate more substantial mouthpieces
• Lip fleshiness: Affects cheekpiece choice more than mouthpiece, but worth noting
• Dental issues: Missing teeth, hooks, or other dental problems affect bit comfort

Consider Sensitivity: Is your horse:

• Very sensitive and reactive?
• Tough and less responsive?
• Young and learning?
• Experienced and educated?

Sensitivity affects whether your horse needs gentler designs or can handle more precise communication.

Evaluate Current Mouthpiece: What are you currently using?

• Single-jointed, double-jointed, or other design?
• What material?
• What thickness?
• How long have you been using it?
• What specifically isn't working?

Step 2: Identify Primary Issues

What are you trying to solve?

If tongue pressure symptoms are present: Primary consideration: Ported mouthpiece (like Bombers Happy Tongue) See our comprehensive tongue pressure guide for detailed information

If horse leans or pulls: Consider: Loose ring cheekpiece (see our cheekpiece guide) combined with either:

• Ported mouthpiece (if tongue pressure contributing to issue)
• Double-jointed (if no tongue pressure signs) Avoid: Mullen mouth which encourages leaning

If palate pressure suspected: Avoid: Single-jointed mouthpieces Consider: Double-jointed or ported designs

If horse very sensitive: Consider: Thicker, gentler designs Options: Double-jointed with French link, low port Material: Sweet iron or copper to encourage acceptance (see our materials guide)

If horse mouthy or busy: Consider: Roller mouthpiece or copper centre This gives them something to do whilst working

If young horse: Start with: Thicker double-jointed (French link) or eggbutt Gentle, clear communication without severity

Step 3: Consider Practical Factors

Budget:

• Basic jointed snaffles: Most affordable
• Anatomical designs (Happy Tongue, Myler, etc.): Mid to premium
• Specialised designs: Variable

Discipline Requirements:

• Check what's legal for your level and discipline
• Some competitions restrict certain designs
• Traditional expectations vary by sport

Material Preferences: Mouthpiece design and material work together:

• Stainless steel available in all designs
• Sweet iron and copper often available in popular designs
• Titanium more limited See our materials guide for detailed material information

Cheekpiece Compatibility: Some mouthpiece designs work better with certain cheekpieces:

• Ported mouthpieces: Available with loose ring, eggbutt, hanging cheek
• Waterfords: Usually loose ring
• Complex designs: May be limited in cheekpiece options See our cheekpiece guide for detailed information

Step 4: Trial and Evaluate

Borrow Before Buying: Try different mouthpiece designs with your horse before purchasing. Many tack shops, riding schools, or fellow liveries may have bits you can trial.

Observe Specific Changes: When trialling different mouthpieces, note:

• Mouth behaviour (opening, crossing, tongue position)
• Acceptance of contact
• Overall relaxation
• Way of going
• Responsiveness to aids
• Salivation (wet vs. dry mouth)
• Any signs of discomfort or improvement

Give Adequate Time: Some horses adapt to new mouthpieces immediately; others need several sessions. Allow at least 3-5 rides before making final judgements, particularly when moving to very different designs (like jointed to ported).

Keep Detailed Notes: Document your observations with each mouthpiece. This information is invaluable for future bit selection and helps identify patterns in your horse's preferences.

Step 5: Professional Assessment

When to Seek Expert Help:

Consider professional bit fitting if:

• You've tried multiple bits without success
• Your horse shows persistent resistance or discomfort
• You're unsure which direction to try
• Your horse has specific mouth conformation issues
• You want to optimise for competition or advanced training

At The Fitted Horse, our bit fitting consultations include:

• Detailed mouth examination
• Assessment of current equipment
• Observation of horse's response
• Recommendations for mouthpiece, material, and cheekpiece
• Proper sizing and fitting
• Follow-up support

Professional fitting considers all factors together - mouthpiece design, material, cheekpiece type, and size - creating a complete solution rather than isolated changes.

Common Mouthpiece Myths Debunked

Let's address some common misconceptions:

Myth 1: "Single-jointed bits are always the gentlest" Reality: Single-jointed bits create significant nutcracker action that many horses find uncomfortable. Double-jointed or ported designs are often gentler.

Myth 2: "Ported bits are severe Western curb bits" Reality: Ported snaffles with appropriately sized ports provide excellent tongue relief without severity. The port design and height determine the action, not the mere presence of a port.

Myth 3: "Thicker bits are always more comfortable" Reality: Whilst often true, excessively thick bits can create palate pressure in horses with small mouths or low palates. The right thickness depends on the individual horse.

Myth 4: "Double-jointed bits don't create tongue pressure" Reality: They create less than single-jointed, but still apply pressure to the tongue. For horses with significant tongue sensitivity, ported designs often work better.

Myth 5: "Mullen mouths are the solution for tongue pressure" Reality: Whilst mullen mouths avoid nutcracker action, they create constant tongue pressure across the entire surface and often encourage leaning. Ported mouthpieces usually provide better tongue relief without encouraging leaning.

Myth 6: "Strong horses need harsher mouthpieces" Reality: "Strongness" usually indicates discomfort, training gaps, or rider issues. Harsher mouthpieces mask problems rather than solving them. Often, making the horse more comfortable (through proper bit fit) resolves the pulling.

Myth 7: "All horses go well in French links because they're the gentlest" Reality: French links are gentle and work well for many horses, but some horses need different solutions. The "gentlest" bit is the one that suits your specific horse's mouth.

Combining Mouthpiece with Material and Cheekpiece

Remember that mouthpiece design works in partnership with material and cheekpiece choices:

The Complete Picture:

Example 1: Sensitive Horse with Tongue Pressure Issues

• Mouthpiece: Ported (Bombers Happy Tongue)
• Material: Sweet iron or copper (encourages salivation)
• Cheekpiece: Eggbutt (stable, no pinching) This combination addresses tongue pressure (mouthpiece), encourages acceptance (material), and provides stability (cheekpiece).

Example 2: Horse Who Leans

• Mouthpiece: Ported (prevents constant pressure to lean against)
• Material: Sweet iron (encourages soft mouth)
• Cheekpiece: Loose ring (discourages fixing) This combination prevents leaning whilst maintaining comfort.

Example 3: Young Horse Learning

• Mouthpiece: Double-jointed with French link (gentle, clear)
• Material: Copper (appealing, warm)
• Cheekpiece: Eggbutt (stable, no pinching, reassuring) This combination provides gentleness, appeal, and clarity for learning.

All three elements must work together. The best mouthpiece in the wrong material or with inappropriate cheekpieces won't achieve optimal results.

See our related guides:

• Mouthpiece Materials Guide for detailed material information
• Cheekpiece Guide for comprehensive cheekpiece information
• Tongue Pressure Guide for specific tongue pressure solutions

Our Recommendations: Mouthpiece Selection by Situation

Based on years of fitting experience, here are our general recommendations:

For Horses Showing Tongue Pressure Symptoms: First choice: Ported mouthpiece (Bombers Happy Tongue, Myler Comfort Snaffle) Second choice: Double-jointed with anatomical lozenge Avoid: Single-jointed, mullen mouth See: Tongue Pressure Guide

For Young Horses (First Bit): First choice: Thicker double-jointed with French link Second choice: Thicker single-jointed if mouth conformation suits Material: Copper for appeal Cheekpiece: Eggbutt for stability

For Sensitive Horses: First choice: Double-jointed with French link or ported design Thickness: Thicker (16-18mm) for gentleness Material: Sweet iron or copper Avoid: Thin bits, twisted/wire bits

For Horses Who Lean: First choice: Ported mouthpiece with loose ring cheekpiece Second choice: Double-jointed with loose ring Avoid: Mullen mouth (encourages leaning) Investigate: Underlying causes of leaning

For Horses with Low Palates: Essential: Avoid single-jointed First choice: Ported design Second choice: Double-jointed Thickness: Moderate (14-16mm) to avoid palate contact

For Horses with Thick Tongues: First choice: Ported mouthpiece for tongue relief Second choice: Double-jointed Avoid: Single-jointed (concentrates pressure) Consider: Slightly thinner mouthpiece to reduce space taken

For Advanced/Competition Horses: Choice depends entirely on individual horse's needs Consider: Refinement of current setup rather than major changes Ensure: All aspects (mouthpiece, material, cheekpiece) optimised Professional fitting: Highly recommended for competitive optimisation

For "Strong" or Pulling Horses: First: Investigate causes (bit fit, training, pain, rider position) Consider: Tongue pressure relief (often the solution) Try: Ported mouthpiece with loose ring cheekpiece Avoid: Jumping to harsh bits without addressing root cause

Special Considerations for Different Disciplines

Different disciplines may have specific considerations:

Dressage:

• Refinement and subtlety important
• Double-jointed or ported common
• French link popular for gentleness
• Material often sweet iron or copper
• Thickness moderate for precision
• Advanced levels may use double bridles (different considerations)

Show Jumping:

• Stability over fences important
• Double-jointed or single-jointed common
• Often combined with eggbutt or D-ring cheekpieces
• Durability considerations for strong horses
• Safety (no excessive moving parts during jumping)

Eventing:

• May use different bits for different phases
• Dressage: Refined mouthpiece (double-jointed or ported)
• Cross-country: Stable, secure design
• Show jumping: As above
• Comfort essential for long days

Showing:

• Tradition and appearance matter
• Classic designs often preferred
• May need to check class requirements
• Neatness and presentation important
• Function still paramount despite aesthetic concerns

Western:

• Often use ported mouthpieces (curb bits)
• Ports designed for tongue relief and palate clearance
• Different traditions around bit progression
• Snaffle work before curb bits

General Riding and Hacking:

• Comfort and safety paramount
• Most versatile options work well
• Consider terrain and riding style
• Safety (avoiding complex bits on trails)

Maintenance and Safety by Mouthpiece Type

Different mouthpieces require different care:

Jointed Mouthpieces:

• Check joints regularly for wear
• Ensure smooth movement at hinges
• Look for cracks or weakness
• Single-jointed: Inspect the joint particularly carefully
• Double-jointed: Check centre piece attachment points

Solid Mouthpieces (Mullen, etc.):

• Inspect for cracks or fatigue
• Check where it attaches to cheekpieces
• Look for any bending or deformation
• Relatively low maintenance otherwise

Ported Mouthpieces:

• Inspect port for cracks or damage
• Ensure smooth edges throughout
• Check attachments to mouthpiece arms
• Verify no sharp edges developing

Complex Designs (Waterford, Roller, etc.):

• Inspect all moving parts
• Ensure rollers move freely
• Check multiple joints for wear
• Clean thoroughly to prevent buildup
• Higher maintenance than simple designs

General Safety:

• Replace any bit showing significant wear
• Never use damaged bits
• Inspect before each use for safety
• Keep clean to prevent irritation
• Store properly to prevent damage

Transitioning to a New Mouthpiece

When changing mouthpieces, particularly to very different designs:

Making the Transition:

Prepare for Adjustment: Expect your horse to need time to adapt, particularly when moving from:

• Jointed to ported
• Thin to thick or vice versa
• Tongue pressure to tongue relief

Initial Sessions:

• Start in familiar, comfortable environment
• Keep work simple and low-stress
• Allow exploration of new feel
• Don't demand perfection immediately

Monitor Carefully: Watch for signs of:

• Improvement (softer, more relaxed, better contact)
• Confusion (uncertainty about new feel)
• Discomfort (new mouthpiece isn't suitable)

Be Patient: Most horses adapt within 3-5 sessions if the new mouthpiece suits them. Persistent problems beyond this suggest the mouthpiece may not be appropriate.

Seek Help if Needed: If the transition isn't going well, professional assessment can identify whether you need to persist, adjust, or try something different.

The Bigger Picture: Holistic Bit Fitting

Mouthpiece selection is crucial, but it's part of a larger picture:

Complete Bit Fitting Includes:

1. Mouthpiece design (what we've discussed in this guide)
2. Mouthpiece material (see our materials guide)
3. Cheekpiece type (see our cheekpiece guide)
4. Correct sizing (width and thickness)
5. Proper fitting (height in mouth, adjustment)
6. Appropriate bridle (see our bridle fitting guide)

All these elements work together. The perfect mouthpiece in the wrong size or with inappropriate cheekpieces won't achieve optimal results.

Beyond the Bit:

Also consider:

• Saddle fit (back pain affects mouth)
• Rider position and hands
• Training foundation
• Horse's physical health
• Dental care
• Overall comfort and wellbeing

Bits are tools for communication. They work best when the horse is comfortable, healthy, well-trained, and ridden sympathetically.

Conclusion: Finding Your Horse's Perfect Mouthpiece

Mouthpiece selection significantly affects your horse's comfort, response, and willingness to work with you. The right mouthpiece distributes pressure in a way that your individual horse finds comfortable, allowing them to relax their jaw, soften their poll, and work in correct carriage naturally.

There is no universally "best" mouthpiece - only the best mouthpiece for your specific horse's mouth conformation, sensitivity, training level, and individual preferences.

What we've learnt through years of professional bit fitting:

• Tongue pressure is a more significant issue than traditionally recognised
• Ported mouthpieces often provide better solutions than mullen mouths for tongue relief
• The "harshest" bit is the one that doesn't fit your horse, regardless of design
• The "gentlest" bit is the one that allows your horse to be comfortable
• Most "strong" horses become soft when made comfortable
• Addressing the mouthpiece often resolves issues that seemed training-related

At The Fitted Horse, we don't recommend mouthpieces based on tradition, popularity, or what's "supposed to" work. We recommend based on your individual horse's needs, observed responses, and our experience fitting thousands of horses.

Sometimes the solution is a simple double-jointed snaffle; sometimes it's a carefully designed ported mouthpiece like the Bombers Happy Tongue; sometimes it's something else entirely. The key is thoughtful assessment and informed choice.

Ready to find the perfect mouthpiece for your horse? Book a professional bit fitting consultation with The Fitted Horse. We'll examine your horse's mouth, assess their current setup, observe their responses, and recommend the optimal combination of mouthpiece, material, and cheekpiece for your horse's individual needs.

Because the right bit isn't just about what goes in the mouth - it's about creating genuine comfort that allows your horse to work with you willingly and happily.

Contact The Fitted Horse today to schedule your appointment.

What mouthpiece does your horse go best in? Have you noticed significant improvements when changing mouthpiece designs? We'd love to hear your experiences in the comments below.

Related Articles:

• Understanding Tongue Pressure in Horses: The Complete Guide
• Bit Mouthpiece Materials: Choosing What's Right for Your Horse
• The Complete Guide to Bit Cheekpieces
• How Martingales Affect Bridle Fit
• The WOW Freespace Bridle: Engineering for Comfort

About The Fitted Horse: We specialise in professional fitting of bridles, bits, saddles, and equestrian equipment. Our approach considers all aspects of bit selection - mouthpiece design, material, cheekpiece type, and sizing - within the context of proper bridle fitting and overall horse welfare. We're proud to be the exclusive UK retailer and fitter of Lumière Equestrian bridles and WOW saddles, and we stock a comprehensive range of bits with various mouthpiece designs to suit every horse's individual mouth conformation and needs. Our focus is always on creating genuine comfort that supports partnership and communication between horse and rider.