Enamel is kind of like the shell of an egg: it protects the softer, more vulnerable part of the tooth inside.
But unlike an eggshell, the thin layer of enamel is tough. In fact, enamel is the hardest substance in the body. It can withstand decades of biting, chewing and crunching -- with some luck and good dental care. Above article from: WebMD.com/oral-health
Another cause of tooth enamel damage is bruxism -- or teeth-grinding. Over time, the constant clenching and friction can wear down or fracture the enamel. In this slide, teeth grinding has ground down the upper and lower front teeth.
Bruxism is often worst when you sleep -- that's when you can't control it. Reducing stress may help. Some people wear a special mouth guard to bed.
