How to Keep Your Mouth Guard Clean and Fresh

Your mouthguard spends hours in your mouth collecting saliva, plaque, and bacteria. If you never clean it, you put all of that right back in your mouth the next time you wear it. Learning how to clean a mouthguard takes about two minutes a day and protects both the guard and your health. This guide covers the exact daily routine, the weekly deep clean, what never to use, and how to fix a mouthguard that smells or looks stained. It applies to night guards worn for teeth grinding and to sports guards alike.

How Do You Clean a Mouthguard Every Day?

Each day, rinse your mouthguard with cool water as soon as you take it out. Gently brush it with mild soap and a soft toothbrush, then let it air dry completely before putting it back in its case. This routine takes about two minutes.

Step 1: Rinse right away. As soon as you remove the guard, rinse it under cool or lukewarm running water. This washes away saliva and debris before they dry onto the surface. Never rinse with hot water. Most guards are made from a thermoplastic called ethylene vinyl acetate (EVA), and heat warps it enough to ruin the fit.

Step 2: Brush gently. Use a gentle-bristled toothbrush kept just for the guard, with a drop of mild dish soap or a non-abrasive toothpaste. A Healthline article medically reviewed in November 2020 lists mild soap, alcohol-free mouthwash, and non-abrasive toothpaste as safe daily cleaners for a mouthguard. Skip whitening toothpaste. Its abrasive particles scratch the surface, and those scratches become hiding spots for bacteria.

Step 3: Dry it fully. This is the step most people skip. A damp guard sealed in a case grows bacteria fast. Pat the guard dry with a clean towel and let it air dry on a clean surface for 15 to 30 minutes before storing it. The Cleveland Clinic’s mouth guard guide, last updated in January 2023, recommends rinsing the guard in cool water, brushing it with soapy water after each use, and letting it air dry.

How Do You Deep Clean a Mouthguard Each Week?

Once a week, deep clean your mouthguard by soaking it in a solution made with a denture cleaning tablet, diluted hydrogen peroxide, or white vinegar for 10 to 30 minutes. Daily brushing removes surface buildup, but a weekly soak gets rid of bacteria that brushing can miss.

Denture Cleaning Tablets

Put a denture cleaning tablet like Efferdent or Polident into a glass of cool or lukewarm water. Once the tablet dissolves, add your mouthguard and let it soak for 10 to 15 minutes or as the package says. Rinse the guard well after soaking. These tablets are safe for dental appliances and will not harm the material.

Hydrogen Peroxide Soak

Mix equal parts 3% hydrogen peroxide and water, then soak the guard for up to 30 minutes. Hydrogen peroxide disinfects the guard and helps lift light stains. Rinse with cool water when the soak is done.

White Vinegar for Buildup

Distilled white vinegar helps remove hard white deposits, like calcium or tartar, that can build up on night guards. Soak your guard in vinegar for about 30 minutes, rinse it, then briefly soak it in hydrogen peroxide to remove the vinegar taste. The Healthline guide from November 2020 recommends this vinegar-then-peroxide method for deep cleaning.

No matter which cleaning method you choose, set a timer. Leaving your mouthguard soaking for too long can damage the material.

What Should You Never Use on a Mouthguard?

Never clean a mouthguard with hot or boiling water, alcohol-based mouthwash, bleach, or abrasive toothpaste. Each one damages the guard in a different way.

Hot water warps the thermoplastic and changes the fit. The American Dental Association’s MouthHealthy resource says to never leave a mouthguard in the sun or in hot water. The only exception is the first-time fitting of a boil-and-bite guard, which is designed for one brief hot-water molding.

Alcohol-based mouthwash dries out and breaks down the guard material, shortening its lifespan. If you like a mouthwash rinse for freshness, use an alcohol-free version and keep the soak brief.

Household bleach is too harsh for a device that goes in your mouth. It degrades the plastic and can leave residue behind. Denture tablets and hydrogen peroxide disinfect just as well without the risk.

Abrasive or whitening toothpaste scratches the surface. Scratches trap bacteria and make every future cleaning harder. Stick with regular non-abrasive toothpaste or plain mild soap.

Also, keep the guard out of the dishwasher. The heat cycle will warp it even if it looks fine afterward.

Why Does My Mouthguard Smell Bad Even After Cleaning?

A mouthguard smells bad when bacteria grow on it between cleanings. If the smell stays after a deep clean, bacteria may be hiding in scratches or small cracks you cannot clean. Dentists say odor is the most common mouthguard problem, and it usually comes from one of four causes.

Skipped drying. A guard stored wet grows bacteria overnight. If your routine is solid but the smell persists, check whether the guard is fully dry before it goes in the case.

A dirty case. A clean guard placed in a dirty case picks the bacteria right back up. Wash the case with dish soap every few days and let it dry completely. Skip the dishwasher here too, since the heat can melt the plastic.

Deep-set bacteria. Try a vinegar soak followed by hydrogen peroxide. If the smell comes back within a day or two, the bacteria are living inside surface damage, and no soak will fix that. At that point, replacement is the answer.

Your own oral hygiene. A guard placed over unbrushed teeth collects everything on them. Brush and floss before the guard goes in each night. If bad breath persists even without the guard, that points to a separate problem worth solving. The team at Falko Family Dental of Rock Hill covers the causes and treatments in this guide to how dentists fix bad breath.

Discoloration follows the same logic. Yellowing or cloudy film that lifts with a vinegar or peroxide soak is buildup. Staining that stays after a deep clean is embedded in the material, and a stained guard that also smells is overdue for replacement.

How Should You Store a Mouthguard at Home and When Traveling?

Store a mouthguard in a sturdy, vented case in a cool, dry spot, and never loose in a bag, a hot car, or a steamy bathroom. Storage mistakes ruin more guards than cleaning mistakes do.

The bathroom feels like the natural home for a night guard, but shower steam and humidity work against you. A nightstand drawer or dresser in the bedroom is a better spot. The vents in the case matter: they let air circulate so leftover moisture evaporates instead of feeding bacteria. The Cleveland Clinic’s January 2023 guidance calls for a sturdy, vented plastic case for storage and travel, kept away from heat.

Two more storage rules save a lot of replacement fees. First, keep the guard away from pets. Dogs are drawn to the saliva scent and will chew a guard into scraps in minutes. Second, when you travel or head to practice, the guard rides in its case, never lose it in a gym bag where it collects bacteria and grime. If a sports guard hits the ground, clean it before it goes back in your mouth.

Night Guard vs. Sports Mouthguard: Is Cleaning Different?

The cleaning steps are the same for a night guard and a sports mouthguard, but the schedule and the wear patterns differ. A night guard (also called an occlusal guard) is worn 6 to 8 hours every night to protect against bruxism, the clinical term for teeth grinding and clenching. A sports mouthguard (also called a mouth protector) is worn for short periods during games and practices, but absorbs physical impact.

For night guards, the enemy is nightly bacterial buildup, so the daily rinse-brush-dry routine and weekly soak matter most. Night guard wearers in Rock Hill dealing with jaw pain or worn teeth can read more about TMJ and bruxism therapy with custom night guards to understand what the appliance is protecting against.

For sports guards, the enemies are grime and impact damage. Clean the guard after every practice and game, and inspect it after any hard hit. A cracked sports guard protects poorly, and the protection is the whole point: according to research summarized on the American Dental Association’s mouthguard page, last updated in August 2025, a 2019 systematic review found mouthguard wearers were 82% to 93% less likely to suffer dental and facial injuries than athletes who went without. If your kid plays football at Northwestern High School or club soccer around Rock Hill, the post-practice rinse habit is worth building early.

If you wear both types, clean them the same way, but store them in separate labeled cases so a grimy sports guard never contaminates the night guard.

When Should You Replace a Mouthguard?

Replace a mouthguard if it has cracks, holes, rough spots, a loose fit, or a smell or stain that persists after deep cleaning. The Healthline guide from November 2020 lists cracks, tears, reduced thickness, deformed shape, gum irritation, and continuous odor as the standard signs of replacement.

Lifespan depends on the guard type and how hard you are on it. According to the Cleveland Clinic’s January 2023 guide, a custom-fitted mouthguard can last several years with proper care, while store-bought guards may need to be replaced a few times a year. Heavy grinders wear through night guards faster, and kids outgrow sports guards as their mouths change.

The simplest way to catch a failing guard early is to let a professional look at it. Bring the guard to your regular dental cleaning and ask for a fit check. “We tell patients to bring their night guard or sports guard to every hygiene visit,” says Klaudia Falkovsky, DMD, at Falko Family Dental of Rock Hill. “Small cracks and rough spots are easy to miss at home, but they weaken the guard and give bacteria a place to hide that no amount of soaking can reach. A thirty-second check tells us whether the guard still fits and still protects.”

If you grind your teeth and need a custom night guard, or you want an existing guard inspected and professionally cleaned in Rock Hill, SC, Falko Family Dental of Rock Hill is a strong choice. The practice makes custom-fitted night guards and TMJ/bruxism splints on site, and Dr. Klaudia Falkovsky and Dr. Andrew Falkovsky check patients’ guards for wear, fit, and hidden damage during routine hygiene visits.

Schedule a Mouthguard Fit Check in Rock Hill

If your mouthguard smells, fits loosely, or shows wear, bring it to your next visit at Falko Family Dental of Rock Hill and the team will check it while you are in the chair. Call (803) 324-3277 or request an appointment online to schedule a cleaning and fit check.