With so many razor sharp teeth, how does a shark prevent injury to its gum?

Answer 1

As the shark bites down, the teeth protrude and the gum line pulls back, the teeth then pull down and back biting off a chunk and pulling it into the mouth. The sickle teeth have ridges the independently bite through and act independently to bite off chinks, a very interesting machine made for eating without thinking. Most sharks, by the way, only eat every few months and save as much energy as possible, they will use as much as three or four months of energy in eating and chasing down food, they are really noted as lazy.

Answer 2

Sharks don't sink their teeth onto their gums.

Answer 3

Their teeth move slightly inward.