Beginning of Essay
Teeth are numerous, hard tissue structures in the mouths of humans. In humans the teeth are composed of nan inner layer of dentin that, above the gum line, is covered by a layer of enamel. Called the crown, this part of the tooth is extremely hard. The root porti ....

Middle of Essay
.... around the age of 6 -by 32 permanent teeth.: 4 central incisors, 4 lateral incisors, 4 cuspids, 8 bicuspids (premolars), and 12 molars. The 4 wisdom teeth develop after the other 8 molars, as the jaws increase in size. If this increase is insufficient, the wisdom teeth may become impacted, that is wedged between the jawbone and other teeth, sometimes resulting in pain and inflammation. The upper teeth, called maxillary, and the lower teeth, called mandibular, are shaped in such a manner that they interdigitate (fit together) when the jaws are closed. This fit is essential for the teeth to function properly when biting food with the incisors (front ....