Craze Lines vs Cracked Tooth: What’s the Difference?
Craze lines are thin, superficial enamel lines that look like small glass cracks. They commonly appear with age from normal wear, chewing hard foods, or temperature changes. We frequently see them in patients over 30.
A cracked tooth is a deeper fracture affecting enamel, dentin, or even the pulp (nerve). It usually results from trauma or excessive pressure such as teeth grinding and can threaten the tooth’s survival.
Key differences:
-Craze lines — surface only, visible in light, no discomfort
-Cracked tooth — may extend toward the root and cause pain when chewing
Do craze lines cause sensitivity?
Typically no. If you feel pain to cold, heat, or biting, the damage is likely deeper.
When can craze lines matter?
If they deepen or trap bacteria, staining or mild irritation may occur, but most require no treatment.
Signs of a true tooth crack:
-Pain when chewing (especially sweets or hard food)
-Sudden sensitivity
-Gum swelling
Chipped tooth fragment
How dentists diagnose it
We use magnification, transillumination, and X-rays. Craze lines stay on the surface, while cracks extend deeper and may appear on imaging.
When to see a dentist
If lines are accompanied by pain or sensitivity, do not wait. Early diagnosis prevents fracture progression and decay.
Schedule a consultation for accurate evaluation and treatment planning.
