Chapter 1 - Anatomy
Structure of the body
Chemical Properties of the Body
Physical Properties of the Body
Vital Properties of the Body
The Human Skeleton - Diagram
Anatomy of the Bones
Bones of the Head
Bones of the Trunk
Bones of the Upper Extremities
Bones of the Lower Extremities
The joints
Uses of the Bones
The Muscles
The Muscles - Front Diagram
The Muscles - Back Diagram
The Teeth
Uses of the Teeth
Digestive Organs
Urinary System
Respiratory Organs
Organs of Circulation
Absorbent Vessels
Organs of Secretion
Vocal Organs
The Skin
The Nervous System
Organs of Sight
Organs of Hearing

1.18 Uses of the Teeth

Use of the Teeth. The incisors cut the food asunder; the molars break down its solid parts, and grind it to a fineness which fits it for the stomach. In masticating the food, the lower jaw has two movements, the upanddown motion, like a pair of shears, and the lateral or grinding motion. These two movements are performed by different sets of muscles. Flesheating animals have only the upanddown motion; vegetableeating animals have only the lateral or grinding motion; while man has both the upanddown and the lateral. This seems a pretty clear intimation that he is to eat both flesh and vegetables. The teeth aid us in articulating words, and they give a roundness and symmetry to the lower part of the face. When well formed, and kept in good condition, they add much to the beauty of the face, and their decay is an irreparable loss. Their proper care and treatment are spoken of in another place.

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