The answer, again, varies by species. Great whites have 50 teeth in their mouth at any given time, while whale sharks have 3,000 tiny teeth that they use to create suction for vacuuming up plankton and shrimp. Whale sharks also have small teeth or dermal denticles on their eyeballs, while other shark species have them all over their skin. (And we thought the ones in their mouths were plenty.) Sharks, of course, continuously shed and replace their teeth. Some species can go through upwards of 40,000 in a lifetime.