Craze lines are small vertical cracks in the enamel of your teeth. They aren’t painful, but they can be unsightly.‌ Craze lines aren’t usually a health problem. But what causes them might be. Dentin.

Dentistry can save your teeth, but it's difficult to know what's happening when you're in the chair. A dentist showed Insider what the process can look like from his point of view. Here's how he fixes ...