Dr.Fustic has cleaned his teeth after every meal for 13 years, and has not had a single decayed tooth. He pointed out that sugar is a major agent(因素) in dental decay, particularly the sugar in sweets, cakes and soft drinks. Ideally you should keep a toothbrush in your pocket and use it immediately after you have finished eating. When this is impractical, you can at least make sure that you have a drink of water and let the water through your teeth to force out any particles of food. Seven out of ten people lose at least half their teeth by the time they are fifty. Many have a complete set of false teeth by that time. In any case, neither toothache nor the visit to the dentist is very pleasant. So it is worthwhile making an effort to keep your own teeth as long as possible. The main preventive (预防的) agent is simply water.
5. According to the passage, what type of food or drink is most likely to cause dental decay?
A. Coca Cola.
B. Milk.
C. Meat.
D. Fried chicken.
6. What does the passage tell us about the condition of Dr. Fustic's teeth?
A. He has had thirteen decayed teeth.
B. He doesn't have a single decayed tooth.
C. He has fewer decayed teeth than other people of his age.
D. He never had a single tooth pulled out before he was fifty.
7. What does Dr. Fustic suggest to prevent dental decay?
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