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Why your dentist keeps asking about your sleep

Jun 14, 2026Dr. Dillon

Sometimes we ask a question that sounds off-topic: how are you sleeping? Some of the first signs of a sleep problem show up in your mouth, and your dentist is often the one who notices them.

What your mouth tells us

A few things we look for, and what they can mean:

  • Worn-down or flattened teeth — often a sign of grinding (bruxism, the clenching and grinding many people do in their sleep without knowing it).
  • A scalloped tongue or sore jaw muscles — a scalloped tongue has wavy, rippled edges where it presses against the teeth, a sign of clenching or tongue pressure overnight.
  • Dry mouth in the morning — often a sign you've been breathing through your mouth as you sleep. A dry mouth loses some of saliva's protection, which raises your risk of decay.1

None of these proves a sleep disorder on its own. Together they can point to one, which is why we note them and ask how you've been sleeping.

Why it matters beyond the tooth

Untreated sleep apnea raises the risk of high blood pressure, heart attack, and stroke.2 When sleep apnea traces back to the jaw or airway, dentistry has a tool that can help. For someone who can't tolerate a CPAP machine — the mask and air pump many people use for sleep apnea — a sleep physician can prescribe a custom oral appliance, a device a dentist fits that holds the lower jaw forward to keep the airway open at night.3

We don't diagnose sleep apnea in the dental chair. That is a physician's call, usually confirmed with an overnight sleep study.4 What we can do is catch the early signs and suggest you talk to a physician who can test for it.

How are you sleeping?

If you wake up tired, your partner mentions snoring, or you clench through the night, tell us next time you're in. Sleep is one of the things we watch for.

References

  1. The National Institute of Dental and Craniofacial Research (NIH), on dry mouth: "Dry mouth also increases the risk for tooth decay or fungal infections in the mouth because saliva helps keep harmful germs in check." The Cleveland Clinic lists mouth breathing among the causes of a dry mouth. NIDCR — Dry Mouth · Cleveland Clinic — Dry Mouth ↩

  2. National Heart, Lung, and Blood Institute (NIH), on the stakes of untreated sleep apnea: "Untreated sleep apnea increases the risk for stroke, heart attack, and other serious problems." The Cleveland Clinic lists high blood pressure among sleep apnea's complications. NHLBI — Sleep Apnea · Cleveland Clinic — Sleep Apnea ↩

  3. American Academy of Sleep Medicine and American Academy of Dental Sleep Medicine, joint clinical practice guideline: "We recommend that sleep physicians consider prescription of oral appliances, rather than no treatment, for adult patients with obstructive sleep apnea who are intolerant of CPAP therapy or prefer alternate therapy." It adds that "An oral appliance helps maintain an open and unobstructed airway during sleep by protruding and stabilizing the mandible." AASM/AADSM — Oral Appliance Therapy Guideline ↩

  4. Cleveland Clinic, on diagnosing sleep apnea: a healthcare provider asks about symptoms and history, and "they'll recommend testing to confirm a diagnosis" — usually an overnight sleep study. Cleveland Clinic — Sleep Apnea ↩

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