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
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