Bet you didn't know..

Sharks have big scary-looking teeth, but did you know that those teeth are always falling out? It’s true! Shark teeth don’t have roots to hold them in place in the shark’s mouth. So they fall out quite often when the shark is eating. In fact, sometimes sharks lose a tooth every week. But those teeth grow back again pretty quickly. Over the course of its life, one single shark may grow as many as 20,000 teeth!