. Public school physiology and temperance [microform]. Physiology; Nervous system; First aid in illness and injury; Physiologie; Nerveux, Système; Premiers soins. r 1 DIGESTION. 61 ing portion of the jaws. The crown of the molars is large, with a broad, uneven surface, intended for grinding the food. The first three kinds of teeth have a single root or fang, but the bicuspids, being marked by a groove on each side, are partially divided into two, hence their name. The molars have two, three, and sometimes four fangs. 5. Structure of a Tooth.—The ^ooth consists of a hard outer portion, the ivor
. Public school physiology and temperance [microform]. Physiology; Nervous system; First aid in illness and injury; Physiologie; Nerveux, Système; Premiers soins. r 1 DIGESTION. 61 ing portion of the jaws. The crown of the molars is large, with a broad, uneven surface, intended for grinding the food. The first three kinds of teeth have a single root or fang, but the bicuspids, being marked by a groove on each side, are partially divided into two, hence their name. The molars have two, three, and sometimes four fangs. 5. Structure of a Tooth.—The ^ooth consists of a hard outer portion, the ivory, and the pulp within. The bulk of the outer portion, situated next the pulp, is called the Fig. 21.—Diagram showing how the teeth fit into each other. Over this, on the crown, is the enamel. Covering the dentine of the root is the cement. Chemically, the dentine is like bone tissue, but the tooth is harder than bone. The pulp is composed of connective tissue, with blood-vessels and nerves. These enter the tooth through the extremity of the fang. The life of the tooth does not correspond with the life of the body. The permanent set begins to appear, as we have said, when the child is about six and a half to seven years of age. Prior to this the crown has been formed, and the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nattress, William; Ontario. Dept. of Education. Toronto : W. Briggs
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