Glencoe Health 2005.pdf

A tooth is made up of three main parts the crown neck

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A tooth is made up of three main parts: the crown, neck, and root, as shown in Figure 14.3 on page 368. The crown is the visible portion of the tooth. It is covered with enamel, a hard substance made of calcium that protects the teeth. periodontium Healthy teeth are a result of good oral hygiene. Explain why it is important to brush and floss after meals. On a sheet of paper, make a list of ways to keep your teeth healthy. Circle the behaviors you engage in regularly. Put a star next to the ones you would like to improve. 367 Lesson 2 Care of Teeth and Mouth
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368 Chapter 14 Personal Care and Healthy Behaviors C ROSS -S ECTION OF A T OOTH A protective layer of enamel covers the crown of a tooth. Inside the tooth, blood vessels supply the living tissue with oxygen and nutrients. Hold the bristle tips at a 45-degree angle against the gumline. Brush back and forth in short strokes. Use a gentle, scrubbing motion. Brush the outer surfaces of each tooth, the inner surfaces, and then the chewing surfaces. To clean the inside surfaces of the front teeth, tilt the brush vertically and make up-and- down strokes. Floss not only between the surface of each tooth but also beneath the gum line. Effective brushing and flossing: Brushing and Flossing Removing plaque from teeth requires two minutes of proper brushing followed by flossing. Beneath the enamel is dentin, a layer of connective tissue that contributes to the shape and hardness of a tooth and acts as a bar- rier to protect the pulp. The is the tissue that contains the blood vessels and nerves of a tooth. Pulp extends into the root canal and provides nourishment to the tooth. Healthy Teeth and Mouth horough, regular oral hygiene is necessary for healthy, clean T teeth. One of the main threats to the health of your teeth is the bacteria that inhabit your mouth and live on the sugar found in foods you eat. is a sticky, colorless film that acts on sugar to form acids that destroy tooth enamel and irritate gums . As plaque coats a tooth, it pre- vents your saliva, which has substances that protect teeth from bac- teria, from reaching the tooth surface. In areas where plaque accumulates, bacteria thrive and the acids from the bacteria break down enamel. If the breakdown of enamel continues, a hole, or cavity, is formed in a tooth. The tooth can continue to decay to the pulp and may have to be removed if left untreated. Tooth decay and other diseases can be easily prevented by prac- ticing good oral hygiene. Brushing teeth after eating removes plaque from the surface of the teeth, before bacteria can produce the acid that harms teeth. Flossing between teeth removes plaque in areas that cannot be reached with the bristles of a toothbrush. Plaque pulp enamel dentin pulp cavity with nerves and vessels gum gingiva cementum periodontal ligaments periodontal membrane root canal bone Crown Root Neck
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Regular visits to a dental care professional are the next most important part of maintaining dental health and ensuring early detection of dental problems. These professionals will clean your teeth and examine them for warning signs of decay.
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