HUMAN teeth may not match those of a tiger shark in size or number - but they are just as strong, research has shown. Scientists made the surprising discovery after comparing the micro-structure ...

For example, the outer layer of a shark’s tooth is composed of an enameloid hydroxyapatite, similar to enamel in human teeth. It contains oxygen atoms from the water the shark lived in.

Anatomy of a Shark Bite: The Teeth Aren't the Only Thing That's Deadly. Amy Tatsch was boogie boarding when a 6-foot bull shark bit into her leg. By ABC News. August 12, 2014, 1:16 PM.