A mouthguard that lives in a damp gym bag is a science experiment. Most custom guards fail at half their rated lifespan because of cleaning and storage mistakes, not because of impact. The full routine that keeps a guard fitting like day one — and the four things you should never do — are below.
Daily care (every session)
- Rinse with cool water immediately after taking it out of your mouth.
- Wipe the inside and outside with a clean cloth to remove visible debris.
- Leave it open to air for at least 15 minutes before closing the case.
- Drop it in the ventilated case the guard shipped in.
The hard rule on temperature: cool water only. Anything over body temperature begins to soften EVA. The fit you paid for lives or dies on this single rule.
Weekly deep clean
Once a week, take five minutes to actually scrub the guard:
- Rinse with cool water to remove surface debris.
- Brush every surface — inside, outside, biting surfaces — with a soft toothbrush and a pea-sized amount of mild liquid soap or unscented hand soap.
- Rinse thoroughly with cool water until no soap residue remains.
- Air-dry on a clean surface for at least 30 minutes.
Full step-by-step including the methods to use and the methods to avoid (denture tablets, peroxide solutions, etc.) in how to clean a mouthguard.
Monthly inspection
Once a month, lay the guard flat in good light and walk through this checklist:
- Any flattened or perforated bite ridges across the biting surface?
- Any cracks, tears, or chips around the edges?
- Has the inside gone chalky-white instead of clear?
- Does the guard still snap onto your teeth without effort?
- Is there persistent odour after a fresh clean?
Two or more "yes" answers means it is time to plan a replacement — see how long does a mouthguard last for the per-sport intervals.
Storage rules
- Ventilated case only. Solid plastic cases that seal tight trap moisture and grow bacteria. The case GumGear ships with is ventilated for this reason.
- Air-dry before closing the case. A damp guard in a closed case turns into a bacterial farm within 24 hours.
- Out of the gym bag, into a dry pocket. Gym bags live at locker-room temperature, which on a hot day climbs into the EVA-distortion range.
- Never in a car. A car interior in summer reaches 120–160°F. EVA glass-transition is around 130°F. The guard will warp and stop fitting in a single afternoon.
Four things to never do
- Hot water. Including dishwasher cycles, kettle rinses, and "just a quick warm rinse to get the soap off." All of it deforms the guard.
- Alcohol-based mouthwash. Listerine and similar alcohol-based rinses are great for your gums and bad for EVA. They break down the cross-linked polymer matrix over time. Cool water and soap only.
- Toothpaste. Covered above — abrasives scratch the surface and the scratches accelerate material breakdown.
- Direct sun and hot surfaces. A guard left on a dashboard, in a sunny windowsill, or on a hot car seat will warp. UV exposure also accelerates EVA yellowing.
The smell problem
Persistent odour means bacteria. Almost always the cause is one of three things: the guard is being stored damp, the case is sealing moisture in, or alcohol-based mouthwash has scarred the surface and bacteria has colonised the microgrooves. Run a full deep-clean cycle from how to clean a mouthguard — if the smell returns within 48 hours, the surface is compromised and the guard should be replaced.
Case-rot: the silent killer
The thing most athletes do not realise is that the ventilated case also needs to be cleaned. Bacteria, sweat residue, and dried saliva accumulate inside the case and re-colonise the guard every time you put it away. Wash the case with mild soap and water once a week, let it air-dry overnight, and replace it once a year regardless of how it looks. GumGear ships with a fresh case for every new guard; if you want a spare, contact us.
When to replace
Plan to replace a combat-sport guard every 3–9 months, a contact- sport guard every 6–12 months, a scuba mouthpiece every 18–36 months, and a night-guard every 12–24 months. Replace sooner if the wear inspection above turns up two or more issues, or after any dental work that changes your bite. Full chart and wear-sign breakdown in how long does a mouthguard last.
Why most pros rotate two guards
Once you train daily, a single guard never fully dries between sessions. Two guards in rotation — one drying, one in use — eliminates the moisture problem completely. The marginal cost of a second GumGear Contact Guard ($99) is far less than the cost of the dental work you avoid by having a guard that is always clean and properly dried. Most working fighters keep two guards as a baseline practice.
