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" ... One big difference between sharks and other fish is their skin. The placoid scales of cartilaginous fishes are more commonly called dermal denticles and are modified teeth-like structures covered with hard enamel. These denticles, which vary in size and shape depending the shark species and where it is located, help decrease drag and turbulence which allows for faster swimming. It also provides protection since these dermal denticles are usually quite tough. ... "