Do You Need a Night Guard for Teeth Grinding or TMJ?

If you grind or clench your teeth in your sleep, a night guard is the usual way to protect them: it takes the wear so your enamel does not. For TMJ pain the answer is less certain, because a guard helps some people and the research on it is limited, so it tends to be one part of a conservative plan rather than the whole plan. A dentist can tell after an exam whether you are grinding and what is worth trying first.

What are the signs you grind your teeth at night?

Most people who grind at night do not know they do it. The American Dental Association notes that dentists and hygienists are often the first to spot it, from chipped or cracked teeth and worn, flattened spots along the biting edges. A partner who hears the grinding is the other common way people find out.

The symptoms you might notice yourself include:

• A sore or tired jaw, or tenderness in the jaw muscles, especially in the morning
• Dull headaches or facial pain on waking
• Earaches or a plugged feeling in the ears, sometimes with ringing
• Teeth that have become more sensitive, or edges that look shorter or chipped
• Pain when chewing, or difficulty opening and closing the mouth fully

None of these on their own proves you grind. Jaw pain in particular has other causes, from sinus trouble to joint problems, which is why it is worth having it looked at rather than guessing.

Do you need a night guard for teeth grinding?

Occasional grinding during a stressful week is common and often needs no treatment. Regular grinding during sleep is different: Cleveland Clinic points out that sleep grinding can do more harm than daytime clenching precisely because you are not aware of it and cannot stop. Over time it can wear enamel, crack teeth or fillings, and loosen teeth.

A night guard does not stop the grinding itself. It puts a layer between the upper and lower teeth, so the force goes into the guard instead of the enamel. That is why dentists often recommend one once there are signs of wear, and why it matters most for people who already have crowns, veneers or implants they want to protect.

Grinding has several contributing factors rather than one cause. Stress and anxiety are the best known. The ADA cites research finding that people who smoke or drink alcohol or coffee are twice as likely to grind their teeth as people who do not. Sleep disorders, including sleep apnea, often travel with grinding, and the ADA notes that a sleep study can help when there are signs of poor sleep.

Does a night guard help with TMJ pain?

TMJ disorders (often written TMD) are problems with the jaw joint and the chewing muscles. According to the National Institute of Dental and Craniofacial Research (NIDCR), they affect about 5% of U.S. adults, are about twice as common in women as in men, and often go away on their own.

Here the evidence is honestly mixed. NIDCR says there is not a lot of evidence on whether oral appliances improve TMD pain, while Cleveland Clinic lists reduced jaw pain, headaches and facial pain among the reasons people wear a guard at night. In practice, a guard can help when clenching or grinding is loading the jaw muscles, and does less when the pain comes from something else.

NIDCR's guidance is to start with simple, reversible steps and to avoid treatments that permanently change your teeth or bite. If you are offered an appliance for TMD, it should be one that protects the teeth without being designed to move them or change how they meet.

Custom vs store-bought night guards: what is the difference?

Store-bought guards come in two kinds: stock guards you wear straight from the box, and boil-and-bite guards you soften and press around your teeth at home. They cost less. Cleveland Clinic notes they are also less effective than custom guards for protecting against grinding, and less durable, often needing replacement a few times a year.

A custom guard is made from an impression or digital scan of your teeth, so it fits your bite exactly. The ADA describes it as giving the closest, most comfortable fit, and Cleveland Clinic says a custom guard can last several years with proper care. Fit matters more than people expect: a guard that sits unevenly can make teeth or the jaw sore, and an uncomfortable guard tends to end up on the nightstand.

One thing to avoid is sleeping in a sports mouthguard. The ADA points out that sports guards have extra cushioning meant for impact, which is usually uncomfortable for a full night.

What else helps besides a guard?

• Stress management, such as exercise, meditation or counseling, which both the ADA and Cleveland Clinic recommend alongside a guard
• Cutting back on caffeine and alcohol, especially in the evening, and stopping smoking
• Noticing daytime clenching, for example while concentrating, and relaxing the jaw when you catch it
• Talking to your doctor about a sleep evaluation if you snore heavily or wake unrefreshed

For severe cases, physicians sometimes use short courses of muscle relaxants or Botox injections into the jaw muscles. These are decisions for an exam, not something to start on your own.

How do you take care of a night guard?

Brush your teeth before putting the guard in. After each use, rinse it in cool water, clean it with a soft brush, let it air dry and keep it in a vented case. Keep it away from hot water and direct sun, which can warp it, and out of reach of pets. Bring it to your checkups so the dentist can look for cracks and wear.