Cracked Tooth Syndrome: Signs, Diagnosis & What Treatment Involves
What Is Cracked Tooth Syndrome?
Cracked tooth syndrome describes an incomplete fracture — usually in a molar — that produces symptoms without being visible on a standard X-ray. The crack flexes when pressure is applied, stimulating the nerve inside.
It is one of the more frustrating dental problems to pin down because the pain comes and goes, is hard to localise, and does not show on routine imaging.
What Does It Feel Like?
- Sharp, brief pain on biting — particularly on one specific spot
- Pain on releasing bite pressure (sometimes worse than the bite itself)
- Intermittent cold sensitivity that lingers slightly
- Difficulty pinpointing which tooth is causing the problem
- No constant ache between episodes
Common Causes
| Cause | Why it leads to cracks |
|---|---|
| Large old fillings | Weakens surrounding tooth walls |
| Long-term grinding | Cumulative enamel fatigue |
| Biting on something hard | Direct fracture force |
| Temperature cycling | Rapid hot-to-cold stress |
| Trauma | Direct blow to the jaw |
Why Is It Hard to Diagnose?
Standard X-rays rarely show an incomplete crack. Diagnosis relies on:
- Bite testing — a small tool placed on individual cusps to find the painful one
- Cold testing — to assess nerve involvement
- Transillumination — a bright light shone through the tooth to reveal crack lines
- Dye staining — a harmless dye that highlights fractures under magnification
Treatment Options
| Crack depth | Treatment |
|---|---|
| Confined to enamel and dentine | Protective crown to stop the crack spreading |
| Reaching the nerve | Root canal treatment, then crown |
| Split through the root | Extraction — the tooth cannot be saved |
The key point: early treatment saves teeth. A crack treated with a crown early may not need root canal treatment. Left for months, the same crack may become unrestorable.
What to Do If You Suspect a Cracked Tooth
- Note which foods or actions trigger the pain
- Avoid chewing hard foods on the suspected side
- Book an appointment and mention: pain when biting, hard to pinpoint
Adult Braces London Team
Written by our GDC-registered dental team and verified for accuracy. This article reflects current clinical guidance for adult orthodontic treatment in the UK.
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