2026-06-12 · 7 min
What is bruxism? Signs, causes, and treatment
What is bruxism
Bruxism is the involuntary habit of clenching or grinding your teeth. It can happen during the day, in moments of concentration or tension, and also at night, during sleep. The nighttime form worries us most in clinic, because the person has no awareness of doing it. The forces it generates are high and they repeat every night for years. That is why the damage builds quietly: by the time a patient notices something, the wear has been advancing for a while. It affects a large share of the adult population, and most people don't know they have it.
This article works as a starting point. Here we gather the essentials, what it is, how to recognize it, why it appears, and how it is treated, and from each section we link to the topics we develop in depth, such as the relationship with stress, the connection with sleep apnea, and headaches of jaw origin.
How to know if you have bruxism
The signs of bruxism are fairly recognizable once you know what to look for. The most common one is waking up with a tense or tired jaw, as if you had worked out with your face. Alongside it, other clues appear alone or combined:
- Tooth wear. Teeth that look flat, worn along the edges, or that lose their natural contour. It is the clearest mark and the one we recognize before the patient does.
- Sensitivity. Teeth that suddenly turned sensitive to cold, to air, or to brushing.
- Jaw pain. Discomfort or fatigue when you open wide, clicking in the joint, tension in front of the ear.
- Morning headache. A headache when you get up, especially around the temples, that usually eases over the hours.
- Marks on the tongue and cheek. A white line on the inner cheek and small indentations along the edge of the tongue, a sign that you press against your teeth.
- Nighttime noise. Your partner telling you they hear you grinding while you sleep.
None of these signs alone confirms the diagnosis, but when several appear together the suspicion is high. If you recognize two or three, a check-up is worth it.
There is one point worth mentioning because so many people search for it. Dreaming that your teeth fall out is one of the most common dreams, and the popular reading links it to stress and anxiety. As dentists we don't interpret dreams, but we do see a concrete, repeated correlate: many of those people grind their teeth while they sleep. The sensation of pressure, of teeth that shift or loosen, can have a real origin in nighttime muscle activity. If that dream shows up often and you also wake up with a tense jaw, it is worth looking into.
Why bruxism happens
The causes group into a few factors that tend to combine.
Stress and anxiety weigh most on awake bruxism, the sustained clenching that shows up with concentration or the tension of the day. In sleep bruxism the link is more indirect: stress and poor sleep act as modulators, changing how you perceive pain and how you rest, rather than tightening the muscle by themselves. The distinction matters because each form is treated differently, which is why we develop it separately in the article on stress and bruxism.
Sleep and airway disturbances, particularly obstructive apnea, also set off grinding episodes. The body clenches the teeth partly to reopen the airway, so bruxism can be the visible tip of a breathing problem that happens while you sleep. It is a relationship worth understanding well, and we explain it in the article on bruxism and sleep apnea.
Occlusal factors get mentioned often, and they are worth placing correctly: they are now considered a factor that may contribute in some people, not the principal cause. The strongest prospective evidence did not find the bite among the predictors of jaw pain, and did find prior health conditions, somatic symptoms, and deteriorating sleep. We address that connection between bite, joint, and headache in bite, TMJ, and headache.
Types of bruxism
It helps to distinguish two axes, because they guide the management.
By the time of day, there is daytime bruxism and nighttime bruxism. The daytime form is usually clenching linked to concentration or tension, and it can often be corrected by becoming aware of the habit. The nighttime form happens during sleep, beyond any voluntary control, and it accumulates the most damage because the forces are greater and nothing holds them back.
By the type of movement, there is clenching and grinding. Clenching is closing hard without sliding, and it mainly generates muscle tension, headache, and joint discomfort. Grinding is sliding the teeth against one another, and it produces the visible wear that flattens the edges. Many people do both.
What happens if it goes untreated
When bruxism goes untreated, the damage advances in stages. First the enamel wears down, which flattens the edges and erases the natural contour of the teeth. Then cracks and fractures appear, in healthy teeth and in earlier crowns, veneers, or fillings, all of which give way under the repeated load. The temporomandibular joint suffers too: pain when chewing, clicking, limited opening. And in some cases the gum recedes and the root becomes exposed.
All of this is cumulative, and once lost, dental tissue does not grow back. That is the underlying reason to act early: it is not about aesthetics, it is about preserving structure that does not return.
How bruxism is treated
Treatment starts with a full clinical evaluation, where we review the wear pattern, the muscles, the joint, and, when needed, sleep. From there we define the plan, which almost always combines protection with managing the cause.
The protective tool is the occlusal splint, which we design custom from an intraoral scan, with no silicone impressions. You wear it at night, it cushions the clenching forces and, when there is joint pain, it also serves to unload the joint and lower the pressure on the retrodiscal zone, the most innervated and vascularized area and the one that hurts most. We have to be honest here: the splint protects and slows the damage, but on its own it does not resolve the underlying cause.
So in parallel we work on whatever is driving the bruxism. If it is stress, management runs through sleep habits, physical activity, and in some cases psychological support. If there is a suspicion of airway or apnea, we refer for a sleep study, because treating the breathing changes the picture at its root. And if there is associated jaw or joint pain, the evaluation is done by our specialist in temporomandibular disorders and orofacial pain, because at that point the goal stops being tooth protection alone and becomes finding the mechanism of the pain.
The question of how to stop bruxism has no single answer, because it depends on the cause. What always applies: cut back on caffeine and alcohol at night, protect your sleep hygiene, lower tension before bed, and protect the teeth with the splint while the origin is treated.
When to see a dentist
If you recognize yourself in several of these signs, an early evaluation changes the outlook. Catching bruxism while it is still only mild wear lets us protect the teeth before fractures appear or rebuilding becomes necessary. What we see most in clinic are patients who arrived late, when the damage was already visible and hard to reverse in terms of tissue.
You don't need to wait for pain. If you wake up with a tense jaw, have frequent morning headaches, notice your teeth looking flatter or feeling sensitive, or someone hears you grinding at night, book a check-up and we'll evaluate it calmly at the clinic in Vitacura.
