Section B
Passage One
Take care of your teeth and your teeth will take care of you. Your teeth are a living part of your body. They have nerves and blood vessels. Diseased teeth can cause pain, die, and fall out. False teeth often do not work as well as natural teeth. If you do take proper care of your teeth, you can keep them your entire life.
Plaque is the main enemy of healthy teeth. Everyone has plaque. It is a sticky, colorless film that coats the teeth. Plaque is always forming on the teeth. Plaque that is left on the teeth for some time hardens. The result is tooth decay and gum disease. The bacteria in plaque live on sugar. They change sugar into acids. If left untreated, decay goes deeper and deeper into the tooth. After a while the decay reaches the nerves and blood vessels of the inner tooth. By the time this happens, the tooth has probably started to ache.
In addition to tooth decay, there are also gum diseases to watch out for. The bacteria in plaque make poisons that attack the gums. Teeth become loose and may fall out. Adults lose most teeth this way.
Gum disease starts slowly. There may be no pain. As a rule, gum disease first appears as swelling. Then the gums become tender. There also may be bleeding. To heal diseased gums, your teeth need one or more dental cleanings. Regular visits to your dentist are a must.
Many people worry about bad teeth. This may result from several causes. It could be due to gum disease or leftover bits of food. It may be caused by plaque. Decayed teeth can cause bad breath.
【英语六级听力的测试模拟二Section B答案解析】相关文章:
最新
2017-01-16
2016-10-21
2016-10-08
2016-10-08
2016-10-08
2016-10-08