The parts of the teeth are the enamel, the dentin, the cementum, the root and the pulp. The enamel is the outer coating and the part that you see. Under the enamel is the dentin, a bone-like structure that has nerves in it. Below the gumline, roots anchor the teeth with the help of cementum that keeps it in place. The pulp is the nerve, soft tissue that takes in nutrition and keeps blood flowing.
Enamel changes color for several reasons. Over time, smoking, drinking, and eating stain teeth. Colas, tea, coffee, and fruits such as blueberries are among the culprits. Teeth might be discolored for other reasons too, and particularly for things that happened in childhood such as damage to a tooth or taking tetracycline antibiotics.
For the most part, having discolored teeth is not a health risk, but having teeth whitened can make a person feel better. Furthermore, good oral hygiene, which should always be practiced, may reduce the incidence of tooth discoloration.
Teeth whitening can be done on the enamel. If a tooth is discolored for reasons other than staining or the dentin is discolored, whitening is unlikely to be effective. Teeth that are stained yellow whiten better than teeth that are brown or gray.
The so-called enamel cap, or visible part of the tooth, can be whitened repeatedly in order to maintain its color. While there is no particular health advantage to getting the cap whiter, whiter teeth can increase a person’s confidence and willingness to smile.