Why You’re Misusing Custom Mouthguards for MMA Training
About the Author :
Moufadi HeyNess is the founder of MMA Fight Nation and a combat sports writer covering MMA, UFC events, boxing, BJJ, and martial arts training.
If you train MMA seriously, custom mouthguards for MMA can be one of the smartest pieces of protective equipment you own—but only if you use them correctly. A mouthguard is not simply something you put in your mouth before sparring and forget about. Fit, thickness, breathing, cleaning, storage, and replacement all matter.
Whether you're preparing for your first amateur fight, hard sparring at your gym, or watching the Ultimate Fighting Championship on UFC tonight, understanding how mouth protection works can help you avoid preventable mistakes.
The problem is that many fighters invest in a quality custom guard and then misuse it.
Here are the most common mistakes—and what you should do instead.
1. Assuming Custom Mouthguards for MMA Are Automatically Perfect
A custom mouthguard is designed specifically around your teeth and mouth. That generally gives it an advantage over generic boil-and-bite guards.
But custom mouthguards for MMA aren't automatically perfect just because they're custom-made.
A poorly fitted guard can still cause discomfort, looseness, excessive gagging, or difficulty speaking and breathing. Your mouthguard should stay securely in place without requiring you to constantly bite down on it.
A good fit should allow you to:
- Keep the guard comfortably in position
- Breathe without unnecessary restriction
- Speak reasonably clearly
- Move your jaw naturally
- Train without constant adjustment
If you find yourself repeatedly pushing the guard back into position during sparring, that's a warning sign.
2. Thinking Thicker Always Means Better Protection
One of the biggest misconceptions about custom mouthguards for MMA is that thicker automatically means safer.
It sounds logical: more material equals more protection.
But mouthguard design involves a balance between protection, comfort, retention, breathing, and jaw movement.
An excessively bulky mouthguard may interfere with your ability to breathe comfortably during intense rounds. That's particularly important in MMA, where you're already dealing with elevated heart rate and oxygen demand.
Instead of simply asking for the thickest possible guard, discuss your training and competition needs with a qualified dental professional.
The goal isn't maximum material.
The goal is appropriate protection without unnecessarily compromising function.
3. Wearing the Same Guard for Everything
MMA isn't one single activity.
Your needs during:
- Technical drilling
- Light sparring
- Hard sparring
- Wrestling
- Competition
- Bag work
can be different.
Some athletes become overly dependent on their mouthguard and wear it for situations where it isn't necessary, while others fail to wear one when contact is expected.
If you're participating in contact training, follow your gym's safety rules and your coach's recommendations. For competition, always follow the applicable athletic commission and event regulations.
And remember: a mouthguard isn't a substitute for proper defensive technique.
4. Forgetting That Fit Can Change
This is where even good custom mouthguards for MMA can become problematic.
Your mouthguard was made for your mouth at a particular point in time.
Your teeth and dental situation can change. Dental restorations, orthodontic treatment, tooth movement, or other changes can affect how the guard fits.
If a previously comfortable mouthguard suddenly feels different, don't simply force yourself to use it.
Have it evaluated.
A mouthguard that once stayed firmly in place may eventually become loose or uncomfortable.
5. Treating Your Mouthguard Like It Doesn't Need Cleaning
Your mouthguard spends a lot of time in a warm, moist environment.
Then you take it out and put it into a gym bag.
That combination isn't exactly ideal.
After training, rinse your mouthguard with cool or lukewarm water and clean it according to the manufacturer's or dental professional's instructions.
Avoid exposing it to unnecessarily high temperatures because heat can potentially alter its shape.
Also clean the storage case regularly.
A dirty case can undermine your cleaning routine because you're simply putting a clean mouthguard into a contaminated container.
A simple post-training routine
Remove → rinse → clean appropriately → air-dry → store in a ventilated case.
Don't leave it buried underneath sweaty gloves, wraps, and clothing.
6. Using Hot Water Without Thinking
This mistake deserves its own section because it is surprisingly common.
People sometimes assume hot water means better cleaning.
Not necessarily.
Heat can affect thermoplastic materials, potentially changing the shape of a mouthguard. That's particularly concerning with a custom-fitted appliance where precise fit is important.
Follow the manufacturer's cleaning instructions rather than improvising.
If your guard suddenly feels different after exposure to heat, don't assume it's "just in your head."
The material may have changed.
7. Chewing on Your Mouthguard During Training
Your mouthguard is protective equipment—not chewing gum.
Constantly chewing, biting, or playing with it can accelerate wear.
It can also make it harder to determine whether the guard is still maintaining the fit and structure it was designed to have.
If you're repeatedly chewing on your guard because it doesn't feel comfortable unless you're biting it, that's another reason to have the fit checked.
A properly retained mouthguard shouldn't require constant chewing to stay where it belongs.
8. Ignoring Damage and Wear
Another common mistake is thinking:
"It's still in one piece, so it's still fine."
Not necessarily.
Inspect your mouthguard regularly for:
- Tears
- Cracks
- Excessive thinning
- Sharp edges
- Significant bite marks
- Deformation
- Changes in fit
- Persistent unpleasant odor despite cleaning
Hard MMA training puts protective equipment through serious abuse.
If the material is visibly deteriorating, consult your dentist or mouthguard provider about replacement.
Don't wait until fight night to discover that your mouthguard has become uncomfortable.
9. Believing a Mouthguard Makes You Invincible
This may be the most dangerous misconception.
Custom mouthguards for MMA are designed primarily to protect the mouth and teeth. They do not make you immune to facial trauma, concussion, jaw injuries, or other consequences of getting hit.
Even professional UFC athletes use extensive defensive skills and training—not just protective equipment—to manage risk.
A mouthguard is one component of a broader safety strategy.
That strategy can include:
- Proper coaching
- Controlled sparring
- Appropriate gloves
- Headgear where applicable
- Good defensive technique
- Reasonable training intensity
- Adequate recovery
- Medical supervision when appropriate
Watching fighters compete on UFC tonight can make combat sports look deceptively simple. But professional fighters have years of technical preparation behind every exchange.
10. Choosing Appearance Over Function
A custom mouthguard can look great.
You can find different colors, designs, logos, and styles.
That's fun—but aesthetics shouldn't be your primary selection criterion.
When choosing custom mouthguards for MMA, prioritize:
- Fit
- Retention
- Comfort
- Appropriate protection
- Breathing and speech
- Material quality
- Durability
- Easy maintenance
Then worry about the design.
Your mouthguard can look incredible, but if you're constantly adjusting it between combinations, it isn't doing its job effectively.
How to Use Custom Mouthguards for MMA CorrectlyThe good news is that proper use isn't complicated.
Before training
Check the mouthguard for visible damage and make sure it still fits comfortably.
If something feels significantly different, investigate the reason instead of ignoring it.
During training
The guard should remain securely positioned without constant biting or adjustment.
If breathing becomes unusually difficult, stop and assess the fit.
After training
Clean it according to the manufacturer's instructions, allow it to dry properly, and store it in a protective ventilated case.
Periodically
Inspect it carefully and have your dental professional assess it when necessary—particularly if your dental situation changes.
Custom vs. Boil-and-Bite vs. Stock Mouthguards
There are three broad categories of athletic mouthguards.
Stock mouthguards are ready-made and generally offer the least individualized fit.
Boil-and-bite mouthguards can be molded at home to improve retention.
Custom mouthguards are produced specifically for an individual's dental anatomy, generally providing a more precise fit.
For serious MMA athletes, the advantages of a properly fitted custom guard can be particularly valuable because MMA combines striking, grappling, clinching, takedowns, and unpredictable movement.
But remember: custom doesn't mean maintenance-free.
The quality of the initial fit and how you maintain the guard both matter.
The Bottom Line
The biggest mistake isn't necessarily choosing the wrong mouthguard.
It's using the right mouthguard incorrectly.
Custom mouthguards for MMA can provide valuable oral protection, but they need to fit properly, remain clean, stay in good condition, and be replaced when necessary.
Don't automatically choose the thickest guard. Don't expose it to unnecessary heat. Don't ignore damage. Don't assume it protects you from every injury. And don't keep using it simply because you paid a lot for it.
Think of your mouthguard like your gloves: protective equipment only works properly when you choose, maintain, and use it correctly.
Whether you're an MMA beginner preparing for your first sparring session or an experienced fighter following the latest UFC action, small equipment mistakes can have surprisingly big consequences.