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 ...

Side and oral views of a virtual model of the jaw of a shark ancestor showing the rows of teeth and reconstruction of the tooth replacement. Image courtesy of Martin Rücklin, Naturalis Biodiversity ...

An in-depth look at shark teeth has found that they contain fluoride, the active ingredient of most toothpaste and dental care mouthwashes.