What is th function of denticles?

Denticles are small, tooth-like structures found on the skin of some fish, such as sharks, and on the shells of certain mollusks. They serve several functions, including providing protection against predators and parasites, reducing drag while swimming, and aiding in the animal's ability to grip surfaces. In sharks, denticles are also believed to help in hydrodynamics, enhancing their swimming efficiency. Overall, denticles contribute to the survival and adaptability of these species in their environments.