... bicuspids (grinders), and four molars (large grinders), in each jaw. Each tooth is divided into the crown, body, and root. The crown is the grinding surface; the body—the part projecting from the jaw—is the seat of sensation and nutrition; the root is that portion of the tooth which is inserted in the alveolus. The teeth are composed of dentine (ivory) and enamel. The ivory forms the greater portion of the body and root, while the enamel covers the exposed surface. The small white cords communicating with the teeth are ... — Searchlights on Health - The Science of Eugenics • B. G. Jefferis and J. L. Nichols
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