TL;DR
Rinse a mouthguard in cool water the moment it comes out, then brush it with a soft toothbrush and mild soap. Never use hot water, which warps the custom fit permanently. Dry it fully and store it in a vented case, never in a closed bag.
Why hot water is the main thing to avoid
Sports mouthguards are made from a thermoplastic that softens with heat. That is exactly how a boil-and-bite guard is fitted in the first place. Any hot water after that point can soften the material again and let it lose the shape it was molded to.
A warped mouthguard does not protect properly, because protection depends on the guard staying seated against the teeth. It also becomes uncomfortable, and a guard that is uncomfortable ends up in a pocket instead of a mouth.
Cool or lukewarm water, always. That rule covers rinsing, washing, and soaking.
How do you clean a sports mouthguard?
Rinse it in cool water immediately after use, then brush all surfaces with a soft toothbrush and a small amount of mild soap. Rinse again until no soap remains, shake off the water, and let it air dry completely before it goes into a vented case.
1. Rinse right away. The single most effective habit. Rinsing while the guard is still wet removes most of what would otherwise dry onto it.
2. Brush both sides. A soft toothbrush kept just for this purpose. Get the biting surface, the inside of every tooth channel, and the gum flange. Use light pressure, since scrubbing hard scratches the surface and scratches hold film.
3. Use mild soap, not toothpaste. Most toothpaste is mildly abrasive and will dull and scratch a mouthguard over time. Mild dish soap or a gentle hand soap works better.
4. Rinse thoroughly. Any soap left behind tastes terrible and stays on something going in a mouth.
5. Air dry completely. Shake the water off and set the guard on a clean surface until dry. Putting a wet guard in a case is the main reason guards develop a smell.
6. Store in a vented case. Ventilation holes let residual moisture escape.
Weekly deep clean options
A weekly soak handles film that daily brushing misses. A denture-cleaning tablet in a cup of cool water is common, following the package direction for time.
Diluted white vinegar and cool water is sometimes used for mineral film. Soak briefly and rinse very well afterward. Never combine vinegar with bleach or any chlorine product, because that reaction produces chlorine gas.
Do not soak a mouthguard in hot water, in bleach, or in hydrogen peroxide for long periods. Bleach degrades the material and leaves residue on something worn in a mouth.
What never to do with a mouthguard
- No dishwasher. Heat plus a heated dry cycle equals a warped guard.
- No boiling water, unless you are deliberately refitting a boil-and-bite guard per its instructions.
- No hot car, dashboard, or windowsill. A guard left in a car on a warm day can deform on its own.
- No microwave.
- No abrasive toothpaste or scouring.
- No sharing. A mouthguard is personal equipment.
Keeping the case clean too
A clean guard in a dirty case does not stay clean. The case is a plastic container that spends its life in a gym bag, and it needs attention.
Wash the case weekly with warm soapy water, scrubbing the hinge and the interior corners with a brush. Rinse it and let it dry fully with the lid open before the guard goes back in.
Choose a case with ventilation holes. A sealed case holds moisture around a guard that is not perfectly dry, which is where odor comes from. The same drying principle applies to a kids water bottle straw and lid, where trapped moisture in a closed part causes the same problem.
Never keep a guard loose in a gym bag. It picks up whatever is in the bag, and it is easy to step on.
Odor, cloudiness, and when to replace
A smell almost always means the guard went into its case damp, or the case itself needs washing. Clean both, dry both, and the smell usually resolves.
Cloudiness or a persistent film that survives a brush and a soak means the surface has been scratched enough to hold material. That is a replacement signal.
Replace a mouthguard when it has tears, thin or chewed-through spots, a loose fit, a shape that no longer matches the teeth, or an odor that will not clear. Growing children outgrow guards quickly, and orthodontic changes can change the fit within weeks.
Questions about fit, jaw discomfort, or whether a particular guard suits a child's teeth belong with a dentist. This article covers cleaning, not dental advice.
Building it into the gear routine
Mouthguard cleaning takes under a minute if it happens right after use. It becomes a chore only when it is skipped and the guard dries out with material on it.
Attach it to something that already happens. Many families clean the guard at the same sink where the shin guards get rinsed after practice, and do the full gear pass, including the bike helmet, on the weekend. Our broader guide on how to clean baby gear and kids equipment safely puts the whole list in one place. The same logic scales up: the house runs better on a fixed cadence too, and home cleaning services are how a lot of families set one.
FAQ
How do you clean a mouthguard after every use?
Rinse it in cool water immediately, brush all surfaces with a soft toothbrush and mild soap, rinse again, and let it air dry fully before storing it in a vented case. Rinsing while it is still wet removes most material before it has a chance to dry on.
Can you use hot water to clean a mouthguard?
No. Mouthguards are made from a thermoplastic that softens with heat, so hot water can distort the molded fit permanently. A warped guard does not seat properly against the teeth and protects less well. Use cool or lukewarm water for every step.
Can you put a mouthguard in the dishwasher?
No. Dishwashers combine high water temperature with a heated dry cycle, which warps the guard and ruins its fit. Hand cleaning with a soft toothbrush and mild soap takes less than a minute and does not risk the shape.
How do you get the smell out of a mouthguard?
Brush it with mild soap, then soak it briefly in cool water with a denture-cleaning tablet and rinse well. Wash the case too, since a dirty case reintroduces odor. Smell that persists after both are cleaned and fully dried usually means the guard should be replaced.
Can you use toothpaste on a mouthguard?
It is not ideal. Most toothpaste contains mild abrasives that scratch the guard surface over time, and scratches trap film that then holds odor. Mild dish soap or a gentle hand soap with a soft toothbrush cleans just as well without dulling the material.
How often should you replace a sports mouthguard?
Replace it when it tears, thins, no longer fits snugly, or keeps an odor after a full cleaning. Growing children and orthodontic changes both shorten the useful life considerably. A dentist is the right person to ask about fit and whether a guard still suits the teeth.
Gear care is quick. Keeping the whole house up through a full sports season is the harder part. Otesse is local, sends background-checked crews, and gives you upfront pricing with no hidden fees. Every home is different, so the real number depends on size, condition, and what you want covered. Get a quote and we will walk you through it.