The teeth in the back of the mouth are small and used for crushing prey, like crustaceans. As with other sharks, the teeth are located in rows which rotate into use as needed. The first two rows are used in obtaining prey, the other rows rotate into place as they are needed. As teeth are lost, broken, or worn down, they are replaced by new teeth that rotate into place. The shark's other senses, like sensing changes in water pressure, eyesight, and hearing, are less important.
Sharks also have an acute sense of smell.
The sensing of minute electrical discharges in the water is accomplished by a series of jelly-filled canals in the head called the ampullae of Lorenzini. This allows the shark to sense the tiny electrical fields generated by all animals, for example, from muscle contractions. It may also serve to detect magnetic fields which some sharks may use in navigation. The Goblin shark is probably harmless, but has rarely been encountered. No one knows the life span of the Goblin shark.