You're mid-bite when it happens. That sound, like a tiny crack of thunder inside your mouth. A second of confusion. Then your tongue finds it: a sharp edge where smooth enamel used to be. Naturally, you wonder if it'll somehow... fix itself. Heal over, maybe? Here's what most people don't realize until they're sitting in a dentist's chair: enamel doesn't regenerate. It's the toughest substance your body produces,
