What Is a Bite Guard? | Protection For Grinding And Clenching

A bite guard is a removable dental appliance that covers the teeth to protect them from grinding, clenching, and wear caused by bruxism.

If you wake up with a sore jaw, headaches, or flattened teeth, you might be grinding your teeth at night. A bite guard—also called a night guard, occlusal splint, or dental guard—sits over your teeth to absorb the force and stop the damage. Whether you need one depends on your symptoms, and the right choice comes down to fit, material, and what you want it to do.

What Does a Bite Guard Do?

A bite guard’s primary job is to reduce damage from bruxism (teeth grinding and clenching). It creates a barrier between your upper and lower teeth so they don’t wear each other down, and it can protect dental work like crowns or veneers. Some people also find it eases jaw-related symptoms.

UC Davis Health recommends bite splints when you experience symptoms from clenching or grinding. The appliance may be worn over the upper or lower teeth, depending on the design and your dentist’s recommendation.

What Are Bite Guards Made Of?

Bite guards come in different materials depending on how they’re made. Hard acrylic is common for custom-fitted guards from a dentist. Over-the-counter versions often use boil-and-bite thermoplastic that softens in hot water and molds to your teeth at home. Silicone and propylene-based elastomers are also used.

The FDA’s device record classifies dental mouthguards as removable appliances fitted by impression or thermoplastic resin. The agency’s 510(k) filing for “The Bite Guard” lists thermoplastic resin and polypropylene-based elastomer among its materials.

Our tested roundup of the best bite guards breaks down which materials hold up best for different sleep styles.

Bite Guard vs. Mouthguard: What’s the Difference?

The terms overlap, but they don’t mean the same thing. A bite guard (or occlusal splint) is designed for bruxism protection—grinding and clenching that happens mostly at night. An athletic mouthguard is thicker and built for sports impact protection, not grinding. Cleveland Clinic notes that sports guards are generally bulkier and serve a different purpose.

One caveat: some dental sources use “bite guard” specifically for bite-alignment issues like TMD or malocclusion, while others use it broadly for grinding protection. The term isn’t perfectly standardized. If you’re buying one for a specific condition, check what the product actually claims to treat.

Should You Get a Custom or Over-the-Counter Guard?

This depends on your symptoms and budget. Here’s the trade-off at a glance:

Boil-and-bite guards can fit poorly if you don’t mold them correctly, so follow the product’s instructions exactly—the method varies by model. Many are designed for one arch only, so check whether you need an upper or lower guard.

If jaw pain, headaches, or bite changes persist even with a guard, see a professional. A guard made for sports isn’t automatically right for night grinding, and vice versa. When symptoms come from another dental or jaw condition, a generic guard won’t fix the underlying issue.

FAQs

How long should a bite guard last?

Most bite guards last between one and five years with nightly use. Custom guards from a dentist tend to hold up longer than boil-and-bite versions. Watch for cracks, holes, or a loose fit—a worn guard loses its protective function and may need replacement.

Can a bite guard fix my jaw pain?

It can help if the pain comes from grinding or clenching. The guard cushions the joint and reduces muscle strain. But if your pain stems from TMD or another condition, you may need a different treatment. A dentist can determine the cause before you commit to a particular guard.

Is it safe to wear a bite guard every night?

Yes, if the guard fits properly, it’s safe for nightly use. A poorly fitted over-the-counter guard can cause discomfort or shift your bite over time. Clean it regularly and check for signs of wear to keep it working as intended.