From baby teeth to ‘conveyor belt’ molars, here’s why humans—and other mammals –grow and replace their teeth in such ...

The cast of the skull of Nigersaurus. The fossil skull of Nigersaurus was one of the first dinosaur skulls to be digitally reconstructed from CT scans. Photograph by Ira Block, Nat Geo Image ...

STONY BROOK, N.Y., July 19 (UPI) -- Some dinosaurs had teeth to spare, shedding old ones as often a twice a month with multiple backup teeth waiting in each tooth socket, U.S. paleontologists say.

A shark continually grows new teeth. Those at the front of its mouth fall away, only to be replaced by fresh rows that move forward like conveyor belts. By contrast, we humans only have two sets of ...