Why do baby teeth fall out?

Baby teeth hang around for only a few years. They do important work during that time, though. Baby teeth help children talk and eat. They also hold a spot for your permanent teeth, so these teeth "know" where to grow. Lots of animals, like kittens and puppies, lose baby teeth, too!

Are babies born with teeth?
Will my baby sister ever get any teeth?
Mom says my baby brother is teething. What's that?
How many teeth do I have?
How do my teeth know when to fall out?