Oral Habits
Why do I keep biting the inside of my cheek?
15 September 2026 · The Dentist, Al Qusais, Dubai
The short answer
Most repeated cheek biting comes from something physical inside your mouth: a sharp or chipped tooth edge, an old filling or crown that sits slightly high, or a bite where your teeth don't quite line up. Once you bite the cheek once, the tissue swells and pokes out further, so you bite it again in the same spot, creating a cycle that can run for weeks. Less often, it's a stress habit similar to nail biting. A dentist can usually spot the cause in a five minute look and smooth or adjust whatever's catching the tissue.
The usual physical causes
Run your tongue slowly around your back teeth. Nine times out of ten, people find a sharp edge on a molar, a chipped corner, or a filling or crown that feels slightly taller than the tooth next to it. Any of these can catch the inner cheek every time you chew, especially on the side you favour when eating.
Your bite matters too. If your upper and lower teeth don't meet quite right, the cheek can get pinched between them on certain movements, particularly when teeth have shifted over the years or a tooth has worn down unevenly. Wisdom teeth coming through at an angle do the same thing, pushing the cheek into the path of the opposing teeth.
Why it keeps happening in the exact same spot
This is the part that frustrates people most. You bite your cheek once, mildly, and don't think much of it. The tissue there swells slightly over the next day, the way any bruise would. That small swelling now sits fractionally further into your bite line than before, so the next time you chew, you catch it again, and it swells more. This cycle can run for two or three weeks before it settles, which is why it feels like it's never going to stop.
The fix isn't to be more careful chewing. It's to remove whatever the original trigger was, because as long as the sharp edge or high filling is there, the cycle will restart every time the swelling goes down.
When it's a habit rather than a dental problem
Some people bite the inside of the cheek deliberately, often without fully noticing, when they're concentrating, anxious or stressed. This is similar to nail biting or clenching the jaw and is sometimes called morsicatio buccarum. It tends to happen on both sides rather than one fixed spot, and there's often a rough, thickened patch of tissue from repeated chewing rather than a single sore ulcer.
If this sounds like you, the habit itself is the thing to work on, though it's still worth having a dentist check there isn't a sharp tooth edge adding to the problem, since the two causes often overlap.
What to do about it now
If a spot has been sore for more than two weeks despite the swelling settling down, or if you can feel an obvious rough edge or a filling that feels high, that's worth getting looked at rather than waiting out. A dentist can smooth a sharp edge or adjust a filling in one short visit, often the same appointment, and it stops the cycle immediately rather than in another two or three weeks.
At The Dentist in Al Qusais, the first checkup is free for new patients, which makes this an easy thing to get checked without committing to treatment first. Dr. Faris Alkhanafseh or Dr. Mohammad Nour can find the trigger, smooth or adjust it, and check your bite properly while you're in the chair. You can book through WhatsApp or online at thedentist.ae/book.
This article is general information, not a diagnosis. If you are in Dubai, the free first checkup at our Al Qusais clinic is the fastest way to get an answer about your own teeth.