There is only one fixed row, but there are four or five rows behind one row. The outermost teeth are upright, and the back rows of teeth are spare, and one row covers the other. Of course, sharks will also wear their teeth during their growth, which also requires timely replacement of their back teeth. Therefore, sharks change their teeth very frequently in their lives.

Many sharks, including great white sharks, have rows of sharp teeth in their mouths. The shapes and sizes of various shark teeth vary greatly, some are serrated cones and some are flat triangles. No matter which type, as long as the teeth in the front row fall off, the teeth in the back will be filled, while sharks such as horned sharks and spiny sharks will line up to replace their teeth.

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Shark teeth are composed of dentin, bone dentin and enamel, and evolved from peltate scales. The shape of teeth is one of the classification criteria. There are many kinds of shark teeth, including comb teeth with different front and back teeth, three-peak teeth with three tips, multi-peak teeth with more than 5-7 tips, single-peak teeth with L large flat edges, stone teeth with a few teeth, a large number of granular teeth and wide and flat cutting teeth.