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).
Tooth enamel is the hard outer shell of a tooth-it's generally smooth, strong, and even a little shiny when really clean. Think of the outer shell of a piece of Chiclet gum. It's also harder than any bone-in fact, it's the hardest substance in your body. But it's not impervious.