Sharks, skates and catfish also have tooth-like structures called denticles that make their skin feel like sandpaper. When ...

New research shows that dentine, the inner layer of teeth that transmits sensory information to nerves inside the pulp, first evolved as sensory tissue in the armored exoskeletons of ancient fish.

Teeth are sensitive because they evolved from sensory tissue in both ancient vertebrates and ancient arthropods.

Anyone who has ever squirmed through a dental cleaning can tell you how sensitive teeth can be. This sensitivity gives ...