Shark teeth are specialized structures that help sharks catch and eat their prey. Unlike human teeth, which are rooted in the jaw, shark teeth are not fixed and can be replaced throughout their lives. A single shark can lose thousands of teeth in its lifetime, with new ones growing in to take their place. Shark teeth come in various shapes and sizes, depending on the species. For example, the teeth of a great white shark are sharp and serrated, ideal for cutting through flesh, while the teeth of a whale shark are small and flat, suited for filtering plankton.