Shark teeth make for great souvenirs and every shark has plenty of teeth. Unlike human teeth, which get replaced once in a lifetime as each individual baby tooth is lost, sharks go through new teeth like sticks of chewing gum. Instead of waiting for each tooth to decay or get broken, a shark will replace all of its teeth at one time with an entire new row of fresh teeth. This occurs between once a week and once every few months depending on the species of shark. In order to keep cycling in new teeth sharks must have several rows growing in at all times. In fact, most of the time a shark will have about five rows and 3,000 teeth all inside their gargantuan maws.
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