Cracked Tooth Syndrome: Why a Tiny Crack Causes Big Sensitivity

Some of the most puzzling toothaches come from cracks so small they barely show on an X-ray. Cracked tooth syndrome is a common cause of unexplained sensitivity — and the earlier it's caught, the smaller the fix.

The tell-tale signs

• A sharp jolt when biting on something specific (a seed, a grain of rice, a nut)
• Pain on release of the bite, not just the pressure
• Sensitivity to cold that comes and goes
• Symptoms that jump around and are hard to pin to one tooth

Why cracks hurt so much

When you bite, the two sides of the crack flex apart slightly. That tiny movement stimulates the pulp inside and, over time, lets bacteria seep in. The nerve responds with sharp, unpredictable pain — and eventually with the lingering ache of pulp inflammation.

Common causes

• Grinding or clenching, especially at night
• Biting unexpectedly on something hard
• Large old fillings that weaken the tooth walls
• Sudden temperature changes (hot coffee then ice water)

How we find and treat it

We use a bite stick to reproduce the symptom, transilluminate the tooth with light, and check with digital imaging. Treatment depends on how deep the crack runs — bonding or an onlay for shallow cracks, a crown to hold the tooth together, or root canal therapy if the pulp is involved. Our CEREC same-day crowns guide explains how we can often protect a cracked tooth in a single visit.

Lingering sensitivity in one tooth is worth a look. Book a visit when you can.