Many of us are wearing down our teeth without even knowing it, and in this case, it has nothing to do with how hard we brush. Sleep bruxism is a common and very real condition affecting a significant number of people across North America. It operates completely below the threshold of conscious awareness, which is exactly what makes it so easy to ignore until the damage is done. Today, we’ll examine what sleep bruxism is, what causes it, how to recognize the warning signs, and suitable treatment solutions.
What is Sleep Bruxism?
Sleep Bruxism is also known as nocturnal tooth grinding. It simply pertains to the process of an individual grinding and clenching their teeth during sleep cycles at night. It is an entirely involuntary condition that doesn’t require consciousness to occur, and it affects a large number of North Americans as a result. The condition enables the grinding, moving, and potential shattering of teeth while asleep and, in most cases, is easily treatable.
Research published in the Journal of Sleep found that regularly occurring sleep bruxism affects approximately 8.6% of the general adult population, with a higher prevalence in younger age groups. In children, that figure climbs as high as 12–20%, and it becomes less common as people get older.
Unlike awake bruxism, which involves clenching or bracing the jaw during the day, often as a stress response, sleep bruxism occurs during specific sleep stages and is driven by a completely different set of neurological processes. Many people have both, though they may not realize it.
The condition is classified by the American Academy of Sleep Medicine as a sleep-related movement disorder. It is associated with rhythmic masticatory muscle activity (RMMA). These are repetitive contractions of the jaw muscles during sleep, which are not fully suppressed by the brain the way protective neuromuscular reflexes are when we’re awake.
The result is that the forces generated during a sleep bruxism episode can actually exceed the forces you’d produce during normal biting and chewing while conscious.
The Difference Between Awake Bruxism and Sleep Bruxism
Before going deeper, it’s worth drawing a clear line between the two forms of bruxism, because the causes, consequences, and management approaches differ in meaningful ways.
Awake bruxism tends to involve jaw clenching or bracing, often during concentration, emotional tension, or stressful moments throughout the day. Many people with sleep bruxism find that once they become aware of the habit, they can interrupt it consciously.
Sleep bruxism is a different story. Because it happens during sleep, primarily during the lighter stages of non-REM sleep, there is no opportunity for self-correction. The forces generated are uncontrolled, and there is no conscious feedback telling your muscles to stop. This is why sleep bruxism causes more significant dental wear and jaw fatigue than the daytime variety.
Some individuals experience both forms. If you notice that your jaw feels tired or tense during the day, that is a sign worth paying attention to, particularly if it is accompanied by the morning symptoms described later in this article.
What are The Causes of Sleep Bruxism (Teeth Grinding)?
The Journal of the Canadian Dental Association has noted that sleep bruxism is no longer considered a condition driven purely by mechanical or psychological factors.
Modern understanding recognizes it as a multifactorial condition, meaning there is rarely one single explanation, and several contributing factors often overlap.
Generally, Sleep Bruxism is caused by predispositions tied to genetics passed down throughout time (which also means that your ancestors may have suffered from the condition as well).
In addition, it is not uncommon for pent-up stress to result in the clenching or grinding of one’s teeth while asleep.
Genetics
Research consistently shows that sleep bruxism runs in families, with studies finding a 2.5 times higher risk of the condition among first-degree relatives of people who grind their teeth during sleep. If a parent or sibling has experienced it, your own likelihood increases accordingly.
Stress and Emotional Tension
Stress remains one of the most widely recognized contributing factors. When the body carries chronic work pressure, unresolved anxiety, and periods of major life change, the jaw muscles can remain in a state of elevated tension that carries into sleep.
This does not mean everyone who is stressed will develop sleep bruxism, but for those who are already predisposed, elevated stress is a known aggravating factor.
Sleep Architecture and Micro-Arousals
Sleep bruxism episodes most commonly occur around micro-arousals. These are brief moments during sleep where the brain partially activates without the person fully waking up. These micro-arousals are associated with increased brain activity, elevated heart rate, and a surge in jaw and throat muscle tone.
The grinding episode typically follows within seconds. This is part of why conditions that disrupt sleep quality, including sleep apnea, are so closely linked to higher bruxism activity.
Medications and Substances
Selective serotonin reuptake inhibitors (SSRIs) used for depression and anxiety have been associated with increased bruxism activity. Stimulant drugs and some antipsychotic medications have also been implicated.
On the lifestyle side, alcohol, caffeine, tobacco, and recreational stimulants all increase the risk. Alcohol in particular is known to disrupt sleep quality and increase the frequency of sleep arousals, which in turn raises the likelihood of bruxism episodes during the night.
Gastroesophageal Reflux (GERD)
A somewhat lesser-known association exists between GERD and sleep bruxism. Acid reflux events during sleep can trigger micro-arousals and increased jaw muscle activity.
This is a connection that often goes unaddressed, because patients and even some clinicians don’t immediately link stomach issues with jaw grinding.
Risk Factors for Sleep Bruxism You Should Know About
Certain groups carry a higher baseline risk of sleep bruxism. Sleep bruxism risk factors are the following.
- Individuals with a family history of teeth grinding or clenching.
- Children and young adults (prevalence decreases with age).
- People experiencing chronic stress, anxiety, or mood disorders.
- Those with obstructive sleep apnea or other sleep disorder breathing conditions.
- Regular alcohol or caffeine consumers, or tobacco users.
- Individuals on SSRIs or other medications known to affect jaw muscle activity.
- People with GERD or other gastrointestinal conditions.
If several of these factors apply to you, that is a reasonable basis for discussing the possibility of sleep bruxism with a professional dentist even before noticeable symptoms appear.
Common Symptoms of Sleep Bruxism
Sleep Bruxism typically comes with symptoms such as tooth or jaw pain in the mornings, noticeable wear-down of tooth enamel, and the recession and/or growth of the toris, otherwise known as the jaw bone.
Because sleep bruxism occurs when you’re unconscious, you may be the last person to know it’s happening. The condition is most often identified by a sleep partner who hears the grinding sounds at night, or by a dental professional who notices the telltale signs of tooth wear during a routine examination. That said, your body does leave clues.
- Morning jaw pain or stiffness.
- Dull morning headaches.
- Tooth sensitivity.
- Visible tooth wear.
- Torus (bony growths on the jaw).
- Cheek damage.
- Ear discomfort or tinnitus.
- Disrupted sleep.
It is worth noting that tooth wear alone is not a definitive indicator. Wear can result from acid erosion, dietary factors, or other oral habits. A thorough clinical assessment is necessary to connect the signs to the diagnosis of sleep bruxism.
The Connection Between Sleep Bruxism and TMJ Disorders
One of the most significant consequences of untreated sleep bruxism is the toll it takes on the temporomandibular joint (TMJ). The TMJ is the hinge-like joint connecting your lower jaw to your skull, and it is responsible for chewing, speaking, and all jaw movement.
When the jaw is subjected to the repeated, forceful loading of nightly grinding, the structures within this joint can begin to wear down or shift out of alignment.
Over time, this can develop into a temporomandibular disorder (TMD), characterized by jaw clicking or popping, limited mouth opening, facial pain, neck tension, and chronic headaches.
The relationship between sleep bruxism and TMD is bidirectional. Bruxism can cause TMJ problems, but existing TMJ dysfunction can also amplify the discomfort associated with grinding. This is why addressing bruxism before secondary joint problems take hold matters considerably. You can read more about the distinction between TMD and TMJ disorders.
Sleep Bruxism and Obstructive Sleep Apnea: A Two-Way Relationship
This is the connection that surprises patients the most, and is one of the more clinically significant findings in sleep medicine over the past decade.
Research has confirmed a clear overlap between obstructive sleep apnea (OSA) and sleep bruxism. People with OSA experience repeated partial or full blockages of the airway during sleep. Each time an apnea event occurs, the brain is forced to briefly arouse from sleep to restore breathing.
These micro-arousals occur far more frequently in people with sleep apnea than in the general population.
If you have been told you grind your teeth and also experience loud snoring, morning headaches, or excessive daytime fatigue, it may be worth undergoing a home sleep test to evaluate for sleep apnea. Addressing both conditions through an integrated approach tends to produce considerably better outcomes than managing either in isolation.
At Ottawa TMJ & Sleep Apnea Clinic, Dr. Dahan is trained to assess both sleep bruxism and sleep-disordered breathing within the same clinical evaluation. This means patients who come in for teeth and jaw grinding are also screened for signs of sleep apnea.
Treatment Methods
There are two different ways to reduce or eliminate occurrences of Sleep Bruxism.
Custom Night Guards and Oral Appliances
A custom-fitted oral appliance, often called a night guard or occlusal splint, is the most widely recommended first-line treatment for sleep bruxism. It creates a barrier between the upper and lower teeth, absorbs and redistributes the grinding forces before they can damage tooth enamel, restorations, or the TMJ.
It is important to understand that a night guard manages the consequences of bruxism rather than eliminating the underlying drive to grind. That said, many patients find that a properly fitted appliance also places the jaw in a more relaxed position, which reduces the intensity of grinding episodes over time. For optimal results, custom appliances made by a dental professional significantly outperform over-the-counter options in fit, comfort, and clinical effectiveness.
At Ottawa TMJ & Sleep Apnea Clinic, appliances are crafted on-site using digital impressions and advanced CAD/CAM technology, which allows for a much more precise fit and a faster turnaround than appliances made through an external dental laboratory.
Addressing Stress and Its Role in Bruxism
For individuals where stress and emotional tension are significant contributors, behavioural strategies can meaningfully reduce grinding activity. Cognitive behavioural therapy (CBT), progressive muscle relaxation, mindfulness practices, and regular physical exercise have all shown benefit in reducing both the frequency and intensity of sleep bruxism episodes. These approaches work best when combined with a protective dental appliance rather than used as a standalone measure.
Considering that results will vary from person to person, dental professionals such as the team at Ottawa TMJ & Sleep Apnea Clinic can help fit you for a night guard or specialized oral appliance. This is usually enough to quell any symptoms and causes and decrease instances of tooth grinding altogether.
Addressing Sleep Bruxism in Ottawa
If you are experiencing symptoms of sleep bruxism and are looking for professional, personalized guidance, Dr. Haissam Dahan at Ottawa TMJ & Sleep Apnea Clinic offers focused care for this type of condition.
The clinic uses same-day digital impressions and CAD/CAM appliance fabrication to create custom oral appliances on-site, reducing both the waiting period and the margin for fit errors. For patients who need it, at-home sleep testing is available to evaluate for sleep apnea without an overnight stay in a lab.
No referral is needed. To book a consultation, contact the Ottawa TMJ & Sleep Apnea Clinic or call (613) 454-1854. The sooner a proper assessment is in place, the sooner you can start protecting your teeth, your jaw, and your sleep.