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).
Toothaches are usually caused by injury or trauma to the tooth. Injury is commonly a result of dental decay (or cavity). A cavity is usually felt when it gets larger and deeper into the layers of tooth structure. The hard outer layer of tooth is called enamel, and the softer layer beneath enamel is called dentin.