From the interior to the exterior, your teeth are made of several different types of tissue. As the American Dental Association points out, there are four types of dental tissue. The innermost tissue is the pulp, which is soft and made up of nerves, connective tissue and blood vessels. Surrounding the pulp are three layers of harder tissues: the dentin, cementum and enamel.
The tooth enamel is the material on the outside of your teeth, on top of the dentin layer. It is made up of small segments called enamel rods. You can think of enamel as the skin of your teeth. Just as your skin protects your inner organs from harm, the enamel protects the interior parts of your teeth from harm. Here's what you need to know about the structure of enamel and what you can do to protect it.