Sports mouthguards: built for impact
A sports mouthguard absorbs and disperses impact forces, protecting teeth, gums, lips, and tongue during contact or collision sports. They're typically thicker (3–4 mm of cushioning material), softer than nightguards, and made from EVA (ethylene-vinyl acetate), the same material in athletic shoe midsoles.
The American Dental Association recommends sports mouthguards for all athletes participating in football, hockey, lacrosse, boxing, martial arts, basketball, soccer, baseball, skateboarding, and rugby. Custom guards reduce the risk of dental injury by an estimated 60 times compared to wearing nothing.
Nightguards: built for grinding
A nightguard (occlusal splint) protects teeth from the slow, sustained forces of clenching and grinding during sleep. It's thinner and harder than a sports guard, typically 1.5–3 mm of dense acrylic or dual-laminate material, and designed to glide smoothly between upper and lower teeth.
Nightguards protect tooth enamel from wear, reduce jaw muscle fatigue, and minimize the risk of cracked teeth from years of bruxism. They're worn while sleeping; trying to use one during sports would offer almost no impact protection.
Why a sports guard won't work as a nightguard
Sports guards are too soft and too thick for nighttime use. They cause:
- Muscle hyperactivity (your jaw works harder, not less)
- Tooth migration from the soft material flexing under pressure
- Excess saliva and discomfort during sleep
- Faster wear-through than a properly designed nightguard
Why a nightguard won't work for sports
Nightguards are too thin and too rigid to absorb impact forces. A blow to the face can shatter a hard nightguard into shards in the mouth. The cushioning material in a sports guard is specifically engineered to absorb and distribute force across the dental arch, a nightguard doesn't do that job.
Custom vs. over-the-counter
For both types, custom-fitted guards (made from impressions of your teeth) are dramatically more effective than boil-and-bite drugstore versions. They fit precisely, stay in place during activity or sleep, last longer, and are more comfortable. Insurance often covers custom nightguards under medical or dental plans.
Sizes, materials, and fit by age
Mouthguard needs evolve significantly from childhood through adulthood. A few practical notes by age:
Kids 6-12: usually a thinner, softer custom guard because their teeth are still erupting and arch sizes change quickly. Often need replacement every 12-18 months. Teenagers in braces: a special orthodontic mouthguard that accommodates brackets, never reuse a pre-braces guard. Adults playing recreational sports: a medium-thickness EVA material guard, custom-fit for maximum protection and comfort. Adult nightguards for grinding: a harder acrylic material, fits over upper or lower teeth, lasts 3-5 years with proper care. Don't share or swap guards, fit is everything for both comfort and protection, and a poorly-fitting guard is worse than none in some cases.
Questions about your specific case?
Every patient's mouth is different. The article above covers the general principles, for a personalized recommendation, schedule a consultation with Dr. Sidhu.