Care of the mouth and teeth; a primer of oral hygiene . ber, according to the peculiarneeds of the individual animal. Some animalspossess teeth for the purpose of preying uponother animals; some for purposes of seizing vege-table material for food. The former of these arecalled carnivora, or flesh-eating animals, and thelatter are called herbivora, or vegetable-eatinganimals. We ourselves, who belong to the type ofanimal whose scientific classification is in the Latinlanguage genus homo, or man, are a combinationof these two types. That is, we eat both animaland vegetable food, and are therefo
Care of the mouth and teeth; a primer of oral hygiene . ber, according to the peculiarneeds of the individual animal. Some animalspossess teeth for the purpose of preying uponother animals; some for purposes of seizing vege-table material for food. The former of these arecalled carnivora, or flesh-eating animals, and thelatter are called herbivora, or vegetable-eatinganimals. We ourselves, who belong to the type ofanimal whose scientific classification is in the Latinlanguage genus homo, or man, are a combinationof these two types. That is, we eat both animaland vegetable food, and are therefore called om-nivorous, which is derived from the Latin omnis,all, and voro, I eat. Some of our teeth are for CARE OF THE MOUTH AND TEETH 15 crushing, cutting and grinding vegetable food,while others are for seizing, tearing, cutting,grinding and crushing animal food. Man, like many other animals, possesses dur-ing a lifetime two sets of teeth; one for earlyinfancy and childhood, which are called tempo-rary or deciduous teeth, and another set replacing. A B C D E Fig. 1.—Temporary Teeth, Left Side. (Burchard) A. Central Incisor B. Lateral Incisor C. Cuspid D. First Molar E. Second Molar these and serving until old age, named perma-nent or secondary teeth. In the temporary set wehave twenty teeth, in the permanent set thirty-two,making fifty-two in all. For purposes of scientific classification each setis given a dental formula, that is, an equation rep-resenting the kind, number and relative positionof the teeth in each set. 16 CARE OF THE MOUTH AND TEETH The dental formula for the temporary set isas follows: Iff Cll M|| = 20 The meaning of this equation is as follows:I, or incisors, two above and two below on eachside of the median line or middle of the face,careofmouthteeth00kauf
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