Full Cementum Layer over Root Description
[Continued from above] . . . four kinds of tissue which make up the tooth. It is enamel and covers the crown (area above the gum line) of the tooth. A bony material called cementum covers the root, which fits into the jaw socket and is joined to it with membranes. Dentin is found under the enamel and the cementum, and this material forms the largest part of the tooth. At the heart of each tooth is living pulp, which contains nerves, connective tissues, blood vessels and lymphatics. When a person gets a toothache, the pulp is what hurts.