There’s no doubt about it—a healthy set of teeth is key to survival in the animal kingdom. Elephants replace their teeth as many as five times in their lifespan and great white sharks spit out old teeth like they’re on a conveyor belt. Both are signs that nature knows the true value of our munchers. Without them, there’s no way to protect yourself or chew your food. Seems Lady Gaga had it right: “C’mon, show me your teeth!”

MORE: The Mouth-Health Connection