If you ever break a bone,
you'll probably need a cast
to hold the pieces of bone steady while they're healing. Casts wrap around the broken
area and can be made out of plaster, fiberglass, or even plastic and air (called an
air cast). When you get a cast, you need to keep it away from water the entire time
it's on. Even though a cast may look and feel a little clumsy, it lets your broken
bone grow back together again, and that's pretty important! After you're better, the
doctor will take the cast off, which doesn't hurt at all.