Teeth is One of a set of hard, bonelike structures rooted in sockets in the jaws of vertebrates, typically composed of a core of soft pulp surrounded by a layer of hard dentin that is coated with cementum or enamel at the crown and used for biting or chewing food or as a means of attack or defense. How do I keep my teeth and gums healthy? What Factors Affect the Color of My Teeth? Why color of my teeth has been changed?