. First book in physiology and hygiene . bad teeth to affect diges-tion ? What are the different uses of teeth ? Why should we take care of our teeth ? Howdo you care for your teeth ? XXYIL—THE FORMATIOX AND CARE OFTHE TEETH. The Parts of a Tooth.—The next time that one ofyour teeth comes out, look at it carefully beforeit is thrown away. You will see the small shinypart, or crown, that showed above your gum; andbesides that, a longer, dull whitish part, the root, orfang, that was down in your gum and held thetooth in place. If you are lookingat a front tooth, you will find theroot in one piec
. First book in physiology and hygiene . bad teeth to affect diges-tion ? What are the different uses of teeth ? Why should we take care of our teeth ? Howdo you care for your teeth ? XXYIL—THE FORMATIOX AND CARE OFTHE TEETH. The Parts of a Tooth.—The next time that one ofyour teeth comes out, look at it carefully beforeit is thrown away. You will see the small shinypart, or crown, that showed above your gum; andbesides that, a longer, dull whitish part, the root, orfang, that was down in your gum and held thetooth in place. If you are lookingat a front tooth, you will find theroot in one piece. If the tooth isa back, or double, tooth, you willfind the root divided into two orthree prongs. The hard, shiny surface of thecrown is called enamel. This enamelis very thin and cracks all the rest of the toothis a soft kind of bone. Little nervesand blood vessels go up through the root into thesoft part of the crown. Since the soft part of the tooth is bone, of whatmineral substance is it chieflv made ? If there is. 1. EnameL 2. Soft bone. 3. The gum. — 80
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