00:00A shark doesn't have permanent teeth. Its entire jaw works like a conveyor belt.
00:05New teeth grow in the back, gradually move forward, and replace the old ones.
00:09In some species, this happens every two to three weeks.
00:12During its lifetime, a shark can replace up to 30,000 teeth.
00:16This system makes its jaws practically permanent.
00:18It's the perfect mechanism for a predator that can't afford to lose its hunting tool.
00:22And the shapes of the teeth in different species are amazingly diverse.
00:26The taiga shark has flat, serrated teeth, like steak knives.
00:29The mako has long, sharp teeth, like needles.
00:32The hammerhead shark has slanted teeth for quickly catching slippery fish.
