He Cracked a Molar in His Sleep

Quick answer: You can crack a tooth without biting anything. Night grinding generates forces several times greater than normal chewing, sustained for minutes at a time, and it fractures teeth that are otherwise perfectly healthy. If one tooth has gone, the others are under the same load.

The call

Nissim, 39, from Nachala U'Menucha, could not explain it. No fall, no hard food, nothing he had bitten. He simply woke one morning with a sharp pain on chewing that had not been there the night before, and a jaw that ached on the left.

He worked in high-tech and had been through a difficult year at work. That turned out to be relevant.

What we found

The lower left first molar had a crack running mesio-distally across the biting surface. It had a modest filling, nothing dramatic, and no decay.

The rest of the examination told the real story:

• Wear facets on the canines and premolars, flat and shiny, matching precisely between upper and lower.
• A scalloped tongue with indentations from the teeth pressing against it.
• Bony ridges on the inside of the lower jaw — tori, which build up in response to years of heavy loading.
• Tenderness in the masseter muscles on both sides.
• Morning headaches, which he had attributed to caffeine.

None of these is proof of grinding on its own. Together they are conclusive.

What we did

For the cracked tooth: we removed the filling, confirmed the crack did not extend to the floor of the pulp chamber, and restored it with a bonded ceramic onlay covering both weakened cusps. The tooth tested vital and stayed that way.

For the cause: a hard acrylic night guard, made from impressions and adjusted at a second visit so it contacted evenly across all the back teeth with smooth canine guidance. That adjustment appointment is not optional. An unadjusted guard can load the joint unevenly and make things worse.

We also talked honestly about the things a dentist cannot fix. Grinding is driven by sleep quality, stress and sometimes airway problems. He mentioned snoring and daytime tiredness, so we referred him for a sleep assessment — grinding is a common travelling companion of sleep apnoea, and treating the tooth without asking that question is a missed opportunity.

The outcome

The onlay is intact three years on. The night guard has visible wear grooves, which is exactly its job: it is being destroyed instead of his teeth, and we replace it roughly every two to three years. His sleep study showed mild apnoea, now managed, and both the morning headaches and the grinding have reduced considerably.

What to do if this happens to you

1. Take morning jaw ache and headaches seriously. They are the earliest warning.
2. Ask someone whether you grind. Partners usually know before you do.
3. Look at your front teeth in the mirror. Flattened, translucent edges are a sign.
4. Get a cracked tooth covered promptly — grinding will keep loading it every night.
5. Have a night guard properly made and adjusted. The boil-and-bite versions from a pharmacy are better than nothing, but they are not equivalent.
6. Mention snoring or daytime tiredness. It may point to something worth investigating.

Waking with jaw pain or a cracked tooth? Ramat Beit Shemesh Urgent Dental Care makes custom night guards and adjusts them properly. 055-985-8845 · WhatsApp https://wa.me/972559858845 · Harav Kook 28/1, Beit Shemesh.

Based on real cases treated at the clinic. Names have been changed.