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).
Dental cavities (caries) are holes in the two outer layers of a tooth called the enamel and the dentin. The enamel is the outermost white hard surface and the dentin is the yellow layer just beneath enamel.Both layers serve to protect the inner living tooth tissue called the pulp, where blood vessels and nerves reside.he acid plaque produced by these bacteria cause the hard inorganic layers of the enamel and dentin to soften. The softened layers are then dissolved by saliva, leaving a hole (cavity) in the tooth. Unless filled by a dentist, the cavity can continue to erode and damage the inner pulp of the tooth.