How to Clean a Mouth Guard (Combat Sports)

Why Mouth Guard Cleaning Matters in Combat Sports

A mouthguard takes direct contact from your saliva, blood from small cuts, and whatever is in the air of a busy gym. In Muay Thai and boxing, you are breathing hard through your mouth between exchanges. In MMA and BJJ, you are grinding in clinches and scrambles where sweat and skin contact are constant.

The reality is a dirty mouthguard is not only an odor problem. It can irritate gums, trigger mouth sores, and it is just bad hygiene when you are training multiple times a week. If you share mats, you already respect cleaning your rashguard and wraps. Your mouthguard deserves the same discipline.

Odor is a moisture problem first

Smell usually shows up when the mouthguard stays wet in a closed case. Bacteria love warm, dark, damp environments. If you stop the moisture cycle, you stop most odor issues before you ever need “strong” disinfecting.

Cleaning protects the fit and the material

Some fighters scrub too hard or use harsh chemicals, then wonder why the mouthguard gets stiff, warped, or rough at the edges. A guard that does not fit right forces you to bite down harder, which makes you tense in sparring and can affect breathing. Clean it the right way and it stays comfortable.

The Best Way to Clean a Mouth Guard After Training

Consider this a “post-round routine.” You do not need fancy products. You just need consistency, gentle cleaning, and full drying.

Daily mouth guard cleaning routine (2 to 3 minutes)

• Rinse immediately with cool or lukewarm water right after you take it out.
• Wash with mild soap and water using clean hands or a soft toothbrush reserved only for the mouthguard.
• Rinse thoroughly so no soap residue is left behind.
• Pat dry with a clean paper towel, then air-dry completely before storing.

Do not use hot water for daily cleaning. Heat can soften and deform some mouthguard materials, especially if you leave it soaking.

If you train twice a day

When it comes to double sessions, the problem is you often need to pack up fast. Rinse, wipe, and keep it in a ventilated spot, not sealed up wet. If you must put it in a case between sessions, leave the case cracked open when you can so moisture can escape.

A note on gel-style guards

Gel-fit mouthguards are designed for shock absorption and comfort, but the surface can still hold bacteria if you let saliva dry onto it. As an example, the Fairtex Gel Mouthguard uses a gel-fit liner designed to mold to your teeth for a secure fit and features an internal wave-design support structure for impact absorption. Treat it like protective gear, rinse right away, wash gently, and let it dry fully before it goes back in your bag. You can see that product here: https://www.fairtex.com/products/fairtex-gel-mouthguard.

How to Disinfect a Mouth Guard (Weekly or After Illness)

Daily cleaning is about removing saliva and surface grime. Disinfecting is about reducing bacteria buildup over time. You do not need to disinfect after every session, but you should do it regularly if you train hard and sweat a lot.

Weekly disinfect routine

• Clean the mouthguard first with mild soap and water, then rinse.
• Soak in a mouthguard-safe disinfecting solution for a short period, based on that product’s directions.
• Rinse thoroughly and air-dry completely.

After you are sick (or if the gym has something going around)

What most fighters overlook is timing. If you trained while getting sick, that mouthguard has been exposed. Disinfect it, and if the material is old or already rough, replace it. Your mouth is not the place to “push through” with worn-out hygiene gear.

Can you use alcohol or bleach?

Avoid bleach and harsh household disinfectants. They can leave residue you do not want against your gums, and they can degrade materials. Alcohol can be too aggressive for some mouthguards and may dry or stiffen certain plastics over time. If you use any disinfectant method, keep it mild, rinse very well, and prioritize products intended for oral appliances.

What Most Fighters Overlook: Drying and Storage

If you want the best way to clean mouth guard and keep it fresh, drying is the real secret. A perfectly washed mouthguard that gets sealed wet in a case will still stink.

Air-dry first, then case it

From years of gym experience, the mouthguards that smell the worst are the ones that live in airtight cases right after training. Rinse and wash, then leave it out in a clean, shaded spot until it is dry to the touch. Once it is dry, store it in a ventilated case.

Keep it out of heat and sun

Do not leave your mouthguard on a car dashboard, next to a heater, or in direct sunlight. Heat can warp the fit. A warped guard is worse than no guard because you will keep adjusting it with your jaw, and that distraction gets you caught in sparring.

Keep the case clean too

Your case collects moisture, dust, and bacteria. Wash the case with mild soap and water, rinse, and let it dry. If the case smells, it will transfer that smell right back onto a clean mouthguard.

What Not to Do (Common Mouth Guard Cleaning Mistakes)

Using toothpaste like it is a toothbrush

Some toothpaste formulas are abrasive. That can scratch the surface and create tiny places for bacteria to hold on. If you use toothpaste at all, use a very small amount and rinse extremely well, but mild soap is usually the safer daily option.

Boiling or scalding water

Fighters hear “boil and bite” and think boiling water is good cleaning. It is not. High heat can deform the guard, especially if you let it sit. Only use heat when fitting a mouthguard, and follow that mouthguard’s fitting instructions.

Throwing it into the dishwasher or washing machine

Dishwashers run hot and use strong detergents. Washing machines bang gear around. Both can warp the shape and leave chemical residue. Keep mouth guard cleaning simple and controlled.

Storing it wet in your gym bag

Now, when it comes to gym culture, the bag is where all smells go to grow. If your mouthguard is wet and sealed in the bag, it will pick up odors from everything else in there. Take 60 seconds to rinse and dry it properly. Your future self will thank you.

When to Replace Your Mouth Guard

Cleaning extends the life of your mouthguard, but it does not make it immortal. At some point, wear and bacteria buildup win.

Replace it if you notice any of these

• Cracks, tears, or rough edges that irritate your gums
• A loose fit, or you must bite down hard to keep it seated
• Persistent odor even after proper cleaning and disinfecting
• Visible discoloration that does not rinse away

If you have braces or dental work changes

If your teeth shift, your mouthguard fit changes. A poor fit means less protection and more jaw tension. Talk to your dentist or orthodontist about the right mouthguard style for your setup.

Match replacement timing to your training load

A fighter training hard for a smoker or a fight camp beats up mouthguards faster than someone doing light pad work twice a week. If you are sparring regularly, treat your mouthguard like wraps, it is a consumable protective item.

If you want to browse protective gear beyond mouthguards, start with the Fairtex Accessories collection and build a kit that supports your training pace.

Deep Cleaning for Stubborn Odor (Without Ruining the Fit)

If your mouthguard still smells after you have been consistent with the daily routine, it usually means one of two things. Either moisture is still getting trapped somewhere, or the surface has wear that is holding bacteria. Before you throw it out, you can do a deeper clean, but you have to keep it controlled.

Think of deep cleaning as an occasional reset, not your everyday method. Aggressive chemicals and high heat are how fighters ruin a good mouthguard.

Step 1: Do a real clean first

Do not skip the basics. Wash with mild soap and water, and rinse thoroughly. If you try to disinfect over saliva buildup, you are just masking the problem.

Step 2: Use a mouthguard-safe soak, then rinse longer than you think

Use a disinfecting method intended for oral appliances, follow the directions, and keep the soak time short. After that, rinse longer than you think you need. If you can taste anything on the mouthguard later, you did not rinse enough.

Step 3: Let it dry fully in open air

Deep cleaning does not matter if you close it up wet again. Air-dry it completely, then store it in a case that lets moisture escape.

When deep cleaning is not the answer

If the mouthguard has deep scratches, rough edges, or it is already losing its fit, deep cleaning will not fix it. That is when replacement is the smarter move. Hygiene is important, but protection and fit are the priority in sparring.

Cleaning by Mouthguard Type (Boil-and-Bite vs Custom vs Strap)

Most cleaning advice works across the board, but the details change depending on what you are wearing. Different styles handle heat, pressure, and surface wear differently, so it helps to know what you actually have.

Boil-and-bite mouthguards

These are common in combat sports because you can fit them at home. The key is protecting the fit you worked for. Avoid hot water for cleaning, do not leave it soaking, and do not “re-boil” it as a cleaning method. Reheating is for refitting, and even then, repeated refits can break down the shape and comfort over time.

Custom mouthguards (dentist-made)

Custom guards usually fit and stay put well, but you still need gentle cleaning and full drying. If you invested in a custom fit, do not gamble with harsh disinfectants or heat. Stick to mild cleaning, mouthguard-safe disinfecting, and good storage. If your dentist gave you specific care instructions, follow those over any general gym advice.

Strap or tethered mouthguards

If your mouthguard has a strap, clean the strap too. Sweat and grime sit where the strap meets the guard and where it touches your headgear or helmet. Wash the mouthguard as normal, then wipe down the strap with mild soap and water and rinse. Drying takes longer with straps, so give it time before you pack it away.

Gel-fit mouthguards

Gel-fit designs focus on comfort and shock absorption, but they still need the same discipline. The Fairtex Gel Mouthguard is built with a gel-fit liner and a wave-design internal support structure, so treat it like performance equipment. Clean gently, rinse fully, and prioritize drying so the surface stays smooth and comfortable against your gums.

Quick Troubleshooting: Cloudy, Chalky, or Weird Taste

Fighters usually notice a mouthguard problem in the worst moment, right before class starts. Here is what those common issues usually mean, and what you should do next.

My mouthguard looks cloudy

Cloudiness often comes from dried saliva film, residue from cleaners, or micro-scratches from aggressive brushing. Start with mild soap and water, rinse longer than normal, and let it dry fully. If it stays cloudy and the surface feels rough, it may be worn enough that bacteria can hold on more easily.

It has a chalky taste or chemical taste

This is almost always residue. Rinse more thoroughly, and do not use harsh disinfectants. If you disinfect, keep it mouthguard-safe and do not exceed the recommended time. A mouthguard should taste like nothing.

It smells fine at home, then smells bad at the gym

That usually points to storage. If it is going into a closed case or a hot bag before it is fully dry, odor will come back fast. Fix the drying step and keep the case clean.

It keeps slipping or I have to bite down hard

That is a fit issue first, not a cleaning issue. A mouthguard that is losing its fit forces jaw tension and makes breathing feel harder. If it is a boil-and-bite, you may need to refit it carefully following the fitting instructions. If it is old, replace it.

Frequently Asked Questions

How do you clean a mouth guard after every practice?

Rinse it right away with cool or lukewarm water, then wash it gently with mild soap and water. Rinse thoroughly so nothing is left on the surface. Pat it dry and let it air-dry completely before putting it in its case. The daily routine matters more than using strong disinfectants, because stopping moisture buildup is what prevents most odor.

What is the best way to clean mouth guard that smells bad?

Start with a normal wash using mild soap and water, then disinfect it using a mouthguard-safe disinfecting solution and follow the label directions. Rinse very well and air-dry fully. If it still smells after you have cleaned the mouthguard and the case, the material may be holding bacteria in scratches or wear spots, and it is usually time to replace it.

How do you disinfect mouth guard without damaging it?

Use a disinfecting method designed for oral appliances or mouthguards, and keep exposure time short. Avoid bleach and harsh household cleaners, since residue and material breakdown are real risks. Disinfecting works best when you clean first, then disinfect, then rinse and dry. If you are unsure, keep it simple and prioritize full drying and clean storage.

Can I use toothpaste for mouth guard cleaning?

You can, but it is not my first choice. Many toothpastes are abrasive and can scratch the mouthguard surface, which makes it easier for bacteria to stick. Mild soap and water is usually a better daily method. If you do use toothpaste, use a small amount, avoid aggressive scrubbing, and rinse extremely well so no taste or residue stays on the guard.

Can you soak a mouthguard in hot water to clean it?

No, avoid hot water for cleaning. Heat can soften and warp the mouthguard, especially if it sits in hot water for too long. Use cool or lukewarm water for routine cleaning. Only use heat when fitting a mouthguard, and always follow the fitting instructions from the manufacturer. Keeping the fit intact is part of keeping your protection reliable in sparring.

How should I store my mouthguard between sessions?

Air-dry it first, then store it in a ventilated case. Do not seal it wet in an airtight container, and do not toss it loose in your gym bag where it collects lint and odor. Also clean the case regularly with mild soap and water, then dry it. Storage is where most mouthguard odor problems start, not on the mat.

How often should I replace my mouthguard for combat sports?

It depends on how hard and how often you train, but replace it anytime it cracks, fits loose, or keeps smelling even after proper cleaning and disinfecting. If you spar frequently or are in fight camp, expect to replace it more often. A mouthguard is cheap compared to dental work, and a clean, secure fit helps you stay relaxed and protected under pressure.

Does a mouthguard protect against concussions?

A mouthguard helps protect teeth and can reduce some jaw-related impact stress, but it is not a guaranteed concussion prevention tool. Good defense, controlled sparring, proper coaching, and the right protective gear all matter. If you are doing heavier sparring, consider pairing a mouthguard with appropriate headgear and smart round management so you can train long-term.

Can I use baking soda to clean a mouthguard?

You can use baking soda occasionally as a deodorizing helper, but do not treat it like a daily scrub. If you use it, keep it gentle, rinse extremely well, and make sure the mouthguard dries completely afterward. If the guard has scratches or rough edges, odor will keep coming back and replacement is usually the better fix.

Can I freeze my mouthguard to kill bacteria and remove smell?

Freezing can reduce odor for some gear, but it is not a reliable cleaning method for something that sits against your gums. If you try it, put the mouthguard in a clean, sealed bag, let it return to room temperature, then wash and rinse it before you wear it. For most fighters, consistent cleaning and complete drying does more than gimmicks.

Why does my mouthguard taste weird even after I cleaned it?

Weird taste is usually leftover soap or disinfectant. Rinse longer than normal and let it air-dry fully. If you are using strong cleaners, back it down to mild soap for daily use and only disinfect when needed. Your mouthguard should not have a taste.

Should I brush my mouthguard with the same toothbrush I use for my teeth?

No. Keep a separate soft toothbrush that is only for the mouthguard, or just use clean hands with mild soap. Using your regular toothbrush can transfer bacteria back and forth, and it also makes it too easy to scrub aggressively and scratch the surface.