How Human Teeth Evolved From Ancient Fish

Scientists have found that tooth enamel may have evolved from ancient fish scales and bones! How did that happen?

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How the enamel that coats your teeth evolved
http://news.sciencemag.org/2015/09/how-enamel-coating-your-teeth-evolved-ancient-fish-scales

“The hardest bit of your body is the enamel coating your teeth. But new analyses of fish fossils, as well as genetic analyses of a living fish species, suggest that this specialized material once served a very different function: to toughen some bones and scales of ancient fish.”

Shark Teeth Have Built-In Toothpaste
http://news.discovery.com/animals/sharks/shark-teeth-flouride-120725.htm

“The outside of shark teeth is made up of fluoride, the active component of most toothpaste.”

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