^w^ Tiny teeth, called `dermal denticles`, make up the outer surface of a shark's skin.
^w^ A shark can wound its intended prey with a body slap. The denticles can break the skin and cause the victim to bleed.
^w^ Shark teeth and denticles in the shark's skin are constructed just like human teeth, with a pulp cavity, dentine, and enamel on the outside.
^w^ The shape of the denticles is unique to each species of shark, and for most species, can only be identified under a microscope.
^w^ There is evidence that the placement of the denticles reduces the friction of the water for fast moving sharks by channeling the water flow over the body. They also help trap a layer of water over the skin, possibly adding a little extra buoyancy.
