A tight, aching jaw by the end of a long library session is one of the more common physical side effects of exam season. Surveys of university students regularly find that a large minority clench their teeth while awake, and the students who report more stress tend to report more clenching. Most of it happens without the person noticing, which is why the first clue is often soreness rather than the habit itself.
What the research on students shows
Much of the work in this area has been done with dental and medical students, partly because they are easy for researchers to reach and partly because their courses are demanding. In a Turkish survey of 379 medical and dental students (Babayiğit and colleagues, BMC Psychology, 2024), awake bruxism was self-reported by 46.6% of dental students and 34.7% of medical students, and higher stress scores were linked with a greater likelihood of bruxism. A Madrid study of first-year dental students (Osses-Anguita and colleagues, International Journal of Environmental Research and Public Health, 2023) classed around 37 to 39% as probable awake bruxers in the years before and after COVID lockdowns.
These are questionnaire studies, so the figures depend on how bruxism was defined, and they show an association with stress rather than proof that stress causes clenching. Still, the pattern is consistent enough that jaw tension during exams should be seen as common, not strange.
Why long study sessions suit clenching so well
When people concentrate hard or feel under pressure, many tense their jaw muscles without meaning to. In everyday life that tension comes and goes. Exam preparation is different: hours at a desk, head forward over a laptop, deadlines piling up over consecutive weeks. That gives the habit far more time to run than an ordinary busy day. Some students clench during the day and also grind at night, and the two can rise together in stressful periods.
How it tends to show up
- jaw muscles that feel tired or tight at the end of a study block, or ache when you open wide
- headaches around the temples, sometimes present on waking
- teeth that feel tender when you bite, or new sensitivity to cold
- a flatmate or partner hearing grinding at night
- over years, chipped edges or front teeth that look flatter or shorter
None of these on its own proves bruxism, and similar symptoms can come from other jaw or tooth problems, so a dental check is worthwhile if they persist.
Habits that can take pressure off the jaw
The most useful single habit is learning the relaxed jaw position: lips together, teeth apart, tongue resting lightly behind the upper front teeth. Teeth should only meet briefly when you swallow or chew. Many people find a cue helps, such as checking the jaw each time they turn a page, start a new practice question or get a phone notification.
Beyond that, the measures that help stress in general also seem to help the jaw. Regular breaks away from the desk, sleep that is not sacrificed to late-night cramming, exercise, and the support services most universities offer during exam periods are all reasonable steps. Chewing gum all day keeps the jaw muscles working, so it is better avoided if your jaw is already sore.
When a night guard makes sense
Daytime clenching responds best to awareness, because you are awake to change it. Grinding during sleep is different, as you cannot consciously stop it. If you wake with a sore jaw or headaches, or someone hears you grinding, a custom-made night guard from a dentist can protect the teeth from wear. It does not cure the grinding itself, but it spreads the forces and takes the load off the enamel. Some students only need one during heavy periods, while others wear it every night.
A pattern that repeats each semester
One tense exam block is unlikely to leave lasting marks. The concern is the same cycle repeating twice a year across a degree, then into a demanding first job. Small amounts of wear add up, and enamel does not grow back. Mentioning jaw tension at a check-up early lets a dentist or OHT record a baseline and watch for change over time. The same mechanism, sustained jaw tension under focus or effort, turns up in other settings too, as our articles on jaw clenching during gaming and teeth clenching during weightlifting explain.
What students often ask
Is clenching during exams normal?
It is common. Surveys of university students have found self-reported awake clenching in roughly a third to almost half of participants, with higher rates among those reporting more stress.
Can it cause damage in one semester?
Visible wear from a single stressful period is unlikely. Ongoing jaw pain, headaches or sensitivity are still worth having checked.
Should I see a dentist or a GP?
A dentist is a good first stop for jaw muscle soreness and tooth wear. If stress or anxiety is affecting your sleep or study, your GP or university health service can help with that side of things.
If exam stress has left your jaw tight or your teeth sensitive, the dentists and OHTs at Lumi Dental can check for wear and talk through practical options, including a night guard if it is needed. See our current offers or read more about general dental care at Lumi Dental.
This article is general information and does not replace individual dental advice.
