A mouth guard is a protective device worn over your teeth to prevent damage from physical impact, teeth grinding, or jaw clenching. Depending on the type, it can shield your teeth during sports, protect them from nighttime grinding, or even help keep your airway open during sleep. Mouth guards come in several varieties, from cheap drugstore options to precision-fitted custom devices, and choosing the right one depends entirely on what you need it for.
How Mouth Guards Protect Your Teeth
Mouth guards work by distributing force and absorbing energy across a wider area rather than letting it concentrate on a single tooth or spot in your jaw. When something hits your face during a sport, for example, the guard spreads that impact across the entire arch of your teeth. This dramatically reduces the risk of fractured teeth, knocked-out teeth, broken jaws, and cuts to your lips and gums.
The material itself plays a key role. Traditional guards use a flexible polymer that cushions the blow, but newer materials can actually stiffen on impact. Research published in ACS Applied Materials & Interfaces found that advanced shock-absorbing materials reduced peak impact force by roughly 60% compared to commercial guard materials, while also tripling the “buffer time,” meaning the force is spread over a longer window so your teeth and jaw absorb less of the shock at any given instant. You don’t need to seek out these cutting-edge materials for recreational use, but it illustrates how even a basic guard makes a meaningful difference.
The Three Main Types
Stock Mouth Guards
These are pre-formed, ready-to-wear guards you can buy at any sporting goods store. They come in standard sizes, which means they rarely fit well. They tend to be bulky, can make breathing and speaking difficult, and offer the least protection of any option. They’re inexpensive, usually just a few dollars, but most dental professionals consider them a last resort.
Boil-and-Bite Guards
Also available over the counter, these are made from a thermoplastic material that softens in hot water. You bite down on the softened guard to mold it roughly to the shape of your teeth. The fit is better than a stock guard but still imprecise. They can feel bulky and may interfere with breathing and speech. For someone trying a mouth guard for the first time or using one occasionally, boil-and-bite guards are a reasonable middle ground.
Custom-Made Guards
A dentist takes an impression or digital scan of your teeth and has a guard fabricated to match your exact dental anatomy. The result fits snugly, stays in place without you clenching to hold it, and is thin enough to let you breathe and talk normally. Custom guards offer the best protection for sports and are the standard choice for nighttime grinding. They’re also the only appropriate option for sleep apnea treatment, since store-bought guards can’t be calibrated to reposition your jaw correctly. The tradeoff is cost: custom guards typically run a few hundred dollars, though dental insurance sometimes covers part of the expense.
Sports and Mouth Guards
The American Dental Association recommends mouth guards for a long list of activities, not just the obvious collision sports. Football, hockey, boxing, lacrosse, rugby, basketball, soccer, wrestling, and martial arts all carry high risk of dental injury. But the ADA’s list also includes sports you might not expect: bicycling, skateboarding, skiing, surfing, gymnastics, volleyball, equestrian events, and even weightlifting.
Despite these recommendations, only a handful of sports actually require them. High school and college rules mandate mouth guards in football, ice and field hockey, and lacrosse. Wrestlers with braces must also wear one at the high school level. At the professional level, boxing is the only sport where mouth guards are required. In every other sport, wearing one is your call, but the dental injury risk is real. A single knocked-out or fractured tooth can cost thousands of dollars to repair and may require ongoing dental work for years.
Night Guards for Teeth Grinding
If you grind or clench your teeth during sleep, a condition called bruxism, a night guard creates a barrier between your upper and lower teeth. Without one, chronic grinding wears down enamel, cracks teeth, and can lead to jaw pain and headaches associated with temporomandibular joint (TMJ) disorders. The guard doesn’t stop you from grinding, but it absorbs the force so your teeth don’t take the damage.
Night guards for bruxism are typically custom-made, since you’ll be wearing one for hours every night and a poor fit means you’ll either stop wearing it or wake up with jaw soreness. Your dentist can also adjust the thickness and material based on how aggressively you grind. Some people go through a guard every year or two from heavy grinding, while lighter grinders may get several years from a single guard.
Mouth Guards for Snoring and Sleep Apnea
A specialized type of mouth guard, often called a mandibular advancement device, works by shifting your lower jaw slightly forward. This repositions the tongue and soft tissues in the back of your throat, opening the airway. For people with obstructive sleep apnea, these devices can reduce symptoms like chronic snoring, nighttime breathing interruptions, daytime fatigue, and even high blood pressure linked to poor sleep quality.
These devices are a common first-line treatment for mild to moderate sleep apnea and can be worn with or without a CPAP machine. They must be custom-fitted by a dentist or sleep specialist. Over-the-counter guards are not designed for this purpose and won’t position your jaw correctly, so they’re not a safe substitute.
How to Care for a Mouth Guard
Rinse your mouth guard with warm water every time you take it out. This removes saliva, plaque, and debris before they dry onto the surface. Store it dry in its case, not soaking in liquid on your nightstand. A wet, enclosed environment is exactly what bacteria thrive in.
For a deeper clean, soak the guard in distilled white vinegar for about 30 minutes once a week or at minimum once a month. Rinse it thoroughly with lukewarm water afterward. Avoid mouthwash, denture cleaners, or hot water for soaking, as these can warp or degrade the material. Don’t leave any guard soaking for more than an hour. Wash the storage case itself every few days with dish soap and let it air dry completely before putting the guard back in.
Bring your guard to dental checkups so your dentist can inspect it for wear, cracks, or changes in fit. Children and teenagers may need replacements more frequently since their teeth and jaws are still shifting. Adults with bruxism should watch for thinning spots or holes that signal it’s time for a new one. A guard that no longer fits snugly has lost much of its protective value.
Choosing the Right Mouth Guard
Your choice comes down to what you’re using it for, how often, and what you’re willing to spend. For casual recreational sports, a boil-and-bite guard from a sporting goods store is a reasonable starting point. For competitive contact sports, especially if you wear braces or have had previous dental work, a custom guard is worth the investment. For nighttime grinding, custom is the standard recommendation because comfort determines whether you actually wear it consistently. And for sleep apnea, custom is the only safe option.
Regardless of type, a mouth guard should let you breathe easily, stay in place without constant clenching, and not cause jaw pain. If you find yourself taking it out because it’s uncomfortable, it’s the wrong fit, and an ill-fitting guard you don’t wear protects nothing.