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The fossil shark teeth come from several different types of ancient sharks including tiger, mako, sand, otodus, lamna, and an ancient shark called carcharodon megalodon. If a shark loses a tooth while biting into something, another tooth from the second row would replace the missing tooth within four minutes. Thus many teeth were lost over the lifetime of a shark.
One of the most popular ancient shark tooth specimens is the otodus. The otodus teeth are easy to differentiate from the shark tooth as they have two smaller side points on either side of the tooth. The teeth are often preserved with nice sharp edges. They are between 15 million and 25 million years old.