The part of the tooth you see is called the crown. The rounded high parts of the back teeth are cusps. The hard white outer covering of the tooth is the enamel. Below the gumline, holding the tooth in the jawbone is the root of the tooth. You can’t see the roots. The inner portions of the tooth consist of the dentin, a bonelike tissue, and the pulp. The pulp is like a house for the nerves and blood vessels at the center of the crown and root.
Teeth have different shapes for different jobs. For example, when you eat, the upper teeth work together with the lower teeth of the same shape to bite, chew, and tear food. The names of these teeth are:
Adults have 32 teeth. Depending on their age, children may have fewer because they lose baby teeth as adult teeth grow.
In addition to chewing, teeth help you to speak clearly. The shape of the arch inside the mouth helps you talk. Many letters of the alphabet cannot be sounded without the help of teeth.
Teeth also give your face its shape and add to the way you look. Not only do clean, healthy teeth help you look good, they contribute to total body health and well-being. And a smile always helps you look your best.