Term paper. A term paper is a research paper written by students over an academic term, accounting for a large part of a grade. Term papers are generally intended to describe an event, a concept, or argue a point.
Figure 1. Crown of the tooth. The teeth are made up of two major parts: the crown and the root. The crown of the tooth is what is visible in the mouth (Figure 1). The root of the tooth is the portion which normally not visible in the mouth and is anchored within the bone (Figure 2).
Enamel is the hard outermost surface of the tooth. Although it's harder than any other substance in the body, over time it can gradually wear away causing teeth to appear yellow and dull. Enamel wear can also lead to tooth sensitivity.