Sharks have a never-ending supply of teeth. They regenerate replacement dentition on an inexhaustible toothy conveyor belt ... which explains why you see so few shark dentists.
But sharks are not all about teeth, despite the bad press. Filter feeders like the megamouth shark, are mostly big (but harmless) mouths; the winghead shark has a head half the length of its body, and; the thresher sharks have a huge tai (ideal for stunning fish before eating them) that can be the same length as its body.