Nighttime Bruxism: Why Do We Grind Our Teeth at Night and How to Relieve It?

You wake up with a tight jaw, throbbing temples, and your partner tells you they heard you grinding your teeth again last night. Welcome to the world of nocturnal bruxism — a very real disorder, often trivialized, yet capable of seriously damaging your teeth in the long run.

Bruxism refers to the act of clenching or grinding teeth, often involuntarily, particularly during sleep. It is estimated that the prevalence of bruxism is about 8% of the adult population worldwide, peaking among those aged 17-30. It is therefore not marginal, and yet many people live with it for years without really knowing what is happening in their mouths while they sleep.

What Happens at Night

Sleep bruxism is a so-called parafunctional activity: your masticatory system kicks in when it has no reason to do so. Nocturnal bruxism is generally unconscious — you are not aware of it at the moment, and that is precisely what makes it insidious. Episodes mainly occur during light sleep, with involuntary muscle contractions of the jaw that can reach considerable force.

A bruxism splint is a thermoplastic dental splint designed to reduce inter-dental wear in patients suffering from bruxism. This splint is worn at night, when bruxism is most pronounced. But before getting to that point, one must first recognize the problem.

Signs That Should Raise Alarm

The difficulty with bruxism is that it doesn’t necessarily hurt at the moment. Symptoms accumulate gradually, and we tend to attribute them to other causes.

Here are the signals not to ignore:

• Painful or stiff jaw upon waking, like after intense physical exertion
• Morning headaches, often localized to the temples or neck
• Increased dental sensitivity, especially to hot, cold, or sweet stimuli
• Shortened, flattened, or slightly chipped teeth: your dentist will be the first to spot them
• Tension in the neck and shoulders upon getting out of bed
• Temporomandibular joint (TMJ) pain: a clicking or discomfort when opening your mouth wide

The most objective sign remains what those around you notice: a characteristic grinding noise during your sleep. If no one sleeps near you, an audio recording of a few nights may be enough to confirm the phenomenon.

Why Do We Grind Our Teeth?

The causes of sleep bruxism are multifactorial and still partially understood. Stress and anxiety are the most common triggering factors.

This is the first mechanism to understand: your body continues to “ruminate” on the tension accumulated during the day even when you sleep. A peak in work stress, a period of overwork, poorly managed chronic anxiety — all contexts that increase the frequency and intensity of episodes.

The relationship between bruxism and stress is well documented, highlighting how chronic stress and emotional pressure can exacerbate this disorder.

But stress does not explain everything. Other factors can trigger or worsen bruxism:

• Certain medications, particularly SSRIs (selective serotonin reuptake inhibitors)
• Caffeine and alcohol, especially consumed in the evening
• Tobacco and certain recreational drugs
• Obstructive sleep apnea syndrome (OSAS) and sleep-related bruxism often coexist. In this case, grinding may be a reflex response of the body to reopen the airways during an apnea. If you snore loudly and feel exhausted despite a full night’s sleep, both disorders deserve to be explored together.
• Genetic factors: bruxism is more common in certain families, although hereditary mechanisms remain poorly identified.

What It Does to Your Teeth (and More)

Dental wear is the first visible damage, and it is irreversible. Enamel does not regenerate. Over several years of untreated bruxism, teeth can significantly shorten, lose their natural shape, or even crack. This leads to costly treatments: crowns, veneers, reconstructions.

But the consequences do not stop there. The temporomandibular joint (TMJ), which connects the lower jaw to the skull, endures abnormal pressure night after night. Over time, dysfunctions of this joint may appear: pain while chewing, partial jaw locking, tinnitus in some cases. Physical manifestations of stress such as headaches, jaw pain, and sleep disturbances are often exacerbated by bruxism, creating a vicious cycle that is difficult to break alone.

Solutions to Relieve Bruxism

There is no single treatment that “cures” bruxism like one treats an infection. The approach is combined and adapts according to the dominant cause.

The Occlusal Splint: The Basic Reflex

This is the first thing your dentist will suggest. The custom-made occlusal splint, made by the dentist, can help protect the teeth. The bruxism splint does not cure bruxism. Its goal is to release occlusal potential and especially to absorb friction forces to preserve enamel. It is therefore not an end in itself, but an essential shield while working on the causes.

The occlusal splint is recommended as soon as bruxism leads to visible dental wear or persistent pain.

There are pharmacy or DIY thermoformable splints, which are cheaper but less precise. For confirmed bruxism, the custom-made splint remains preferable: it distributes pressures better and fits exactly to your dental morphology.

Working on Stress

Methods such as stress management through relaxation techniques, regular physical exercise, and improved sleep quality can be beneficial in reducing bruxism.

In practice, this can take several forms depending on your profile. Cognitive-behavioral therapy (CBT) is particularly effective when anxiety is the main cause: it helps reprogram thought patterns that maintain tension. Sophrology, yoga, or cardiac coherence practiced regularly before bedtime can also reduce the activation level of the nervous system at the time of falling asleep.

Biofeedback, a technique that teaches to consciously relax the jaw muscles using sensors, shows good results in clinical studies, although it remains less accessible in France.

Revising Certain Lifestyle Habits

A few simple adjustments can reduce the frequency of episodes:

• Eliminate coffee after 2 PM and alcohol in the evening
• Avoid chewing gum during the day (it overstimulates the masticatory muscles)
• Practice gentle jaw stretching exercises in the evening: gently open the mouth, hold for a few seconds, relax
• Apply heat (hot water bottle, warm compress) to the cheeks and temples in the evening to relax the muscles

When to Consult Urgently

If the pain intensifies, if you have difficulty opening your mouth, or if someone close to you reports significant snoring associated with breathing pauses, consult without delay. The role of the doctor is primarily to direct: to a dentist to assess wear and consider a splint, to a psychologist or sophrologist if anxiety is involved, or to a sleep specialist in case of apnea.

Bruxism can indeed mask an undiagnosed OSAS, and in this case, treating only the jaw is not sufficient.

Bruxism and Sleep Quality

This disorder is not treated in isolation. Fragmented, non-restorative sleep maintains a general level of tension that perpetuates bruxism, and bruxism, in turn, disrupts deep sleep cycles. To break this cycle, it is useful to take a holistic view of your sleep hygiene: regular hours, a cool room, turning off screens at least an hour before sleeping, and if necessary, a foundational work on stress management.

To delve deeper into all common sleep disorders, their causes, and solutions, our section sleep disorder tips gathers practical guides organized by theme.