What are sharks teeth used for?

Answer 1

It depends on the shape and size of the tooth and what shark they belong to. A tiger shark's tooth is used to crush it's prey ( turtles ) and to grab onto the prey so it won't escape easily. mako shark's teeth are used for slicing it's prey and keeping it from slipping away out of it's mouth. Almost all sharks use their teeth to keep their prey from getting away.

Answer 2

Placoid scales, or dermal denticles. They are tiny tooth like structures which give their skin a rough, sand paper like texture. :)