I think we can all agree that going to the dentist is one of the most unpleasant experiences a human can undergo. Just thinking of the shrill whine of the dentist's drill is enough to make me cringe. Unfortunately, going to the dentist is something we all must do if we don't want to have disgusting teeth. However, there is good news: scientists have just figured out a way to grow back tooth enamel, meaning that you might never have to get another filling for those pesky cavities. Hooray!