Remineralization is a natural tooth repair process. Your body takes calcium and phosphate minerals from your saliva and deposits them in your enamel. Enamel is the protective outer layer of your teeth ...

Enamel — or the tough, outer covering of your teeth — is one of the strongest substances in your body. But it does have it limits. A forceful blow or excessive wear and tear can cause teeth to chip.

You're crunching ice or a piece of hard candy when you notice something hard in your mouth that doesn't melt or dissolve. You get a sick feeling as you realize what it is -- a piece of broken tooth.