Dermal denticles are small, tooth-like structures found on the skin of certain fish, particularly sharks and rays. These unique features are made of a hard material called dentin and are covered by a layer of enamel. Dermal denticles serve various functions, including reducing drag while swimming and providing protection against predators. Unlike scales, dermal denticles are embedded in the skin and have a rough texture, which helps to streamline the fish's body in water. Their design also contributes to the fish's ability to move efficiently and can even aid in camouflage by blending with the surrounding environment.