
Shark jaws contain multiple rows of sharp, serrated, triangular teeth, and are continuously replaced as they shed. Classic shark bites are crescent-shaped. Another common wound pattern is a series of parallel cuts caused by the shark raking its teeth on the person. Sharks bites can cause massive tissue loss, with a tooth-to-tooth biting force that has been estimated to approach, in the extreme, 18 tons per square inch. Most bites, however, result in cuts that are not deep, or puncture wounds that do not cause blood vessel or nerve injury. Here you can see a classic pattern of shark bite.