Teeth Grinding (Bruxism): Why It Happens and How a Nightguard Helps

Bruxism is the medical term for grinding, clenching, or gnashing your teeth, which can happen during sleep or while awake, often without the person being fully aware they're doing it, particularly with sleep-related bruxism.

Stress and anxiety are among the most commonly cited contributors to bruxism, since the tension people carry during the day can translate into jaw clenching or grinding during sleep. Misaligned teeth or an uneven bite can also contribute in some people. Certain lifestyle factors, including high caffeine or alcohol intake, and some medications, have also been associated with increased grinding in some individuals. Sleep disorders, including sleep apnea, are linked to bruxism in some people as well.

Waking up with a sore jaw, a dull headache, or tight facial muscles are common signs, especially if these symptoms are worse in the morning and ease throughout the day. Visible wear or flattening on the biting surfaces of your teeth, increased tooth sensitivity, and a partner noticing grinding sounds at night are also common indicators.

Teeth aren't designed to withstand the sustained, repeated force involved in grinding, which is significantly more pressure than normal biting and chewing. Over time, this can wear down enamel, cause or worsen cracks in teeth, damage existing dental work like crowns and fillings, and contribute to jaw joint discomfort.

A dentist can often identify signs of grinding during a routine exam, based on characteristic wear patterns on your teeth, even if you're not personally aware you grind. In some cases, particularly if a sleep disorder is suspected as a contributing factor, a referral for a sleep study might be recommended to investigate further.

A custom-fitted nightguard, worn while sleeping, creates a protective barrier between your upper and lower teeth, absorbing the force of grinding or clenching rather than allowing that force to directly wear down and damage your natural teeth. It doesn't stop the underlying grinding habit itself, but it protects your teeth and dental work from the physical damage that habit would otherwise cause.

A custom nightguard, made from an impression of your specific teeth by your dentist, generally offers a more precise, comfortable fit and better protection than a generic, one-size-fits-all option purchased over the counter. Over-the-counter guards can be a reasonable lower-cost starting point for milder cases, though a custom option is generally recommended for more significant grinding or if an initial over-the-counter guard isn't providing adequate comfort or protection.

Since a nightguard protects your teeth but doesn't address why you're grinding in the first place, it's worth considering the underlying contributor in your specific case. If stress is a significant factor, stress management techniques or addressing the source of stress directly can help. If a bite misalignment is contributing, orthodontic treatment might be worth discussing. If sleep apnea is suspected, addressing that condition directly, sometimes in coordination with a sleep specialist, can also reduce associated grinding.

Yes, bruxism is fairly common in children as well, often related to teeth and jaw development, and many children outgrow it as their permanent teeth come in and their bite settles. Persistent or severe grinding in children is still worth mentioning to a pediatric dentist to monitor for any impact on developing teeth.

Continued, untreated grinding can lead to progressively worn or flattened teeth, an increased risk of cracked teeth, damage to existing crowns or fillings, and in some people, chronic jaw joint discomfort or headaches related to the ongoing muscle tension involved.