開頭段的兩句話首先引入話題和給出結論：
How many teeth have you had filled in the past two years?If you follow the advice of Dr. Faustick you may be able to reduce the number of your visits to a dentist.
緊接着引出Dr. Faustick的對照試驗：早晚刷牙組和每頓飯後刷牙組：
Dr. Faustick conducted a two-year survey to find out how to prevent or reduce dental decay. 946 students took part in an experiment. 523 students cleaned their teeth within ten minutes of eating when possible they used a toothbrush, when this was impossible they washed their mouth thoroughly with water. The remaining 423 students merely cleaned their teeth when they went to bed and when they got up in the morning.
給出對照試驗的結果：每頓飯後刷牙組效果好於早晚刷牙組
All the students had their teeth X-rayed at the end of the first and second years. At the end of the first year, the night and morning group had three times as many decayed teeth as the clean after each meal group. At the end of the second year the latter group had 53 percent fewer decayed teeth than the former group.
研究者自己的切身經歷的結果進一步來證實實驗結果並給出原因分析是因爲食物中的糖分是主要影響因子。
Dr. Faustick has cleaned his teeth after meal for thirteen years and has not had a single decayed tooth. He pointed out that sugar is a major agent in dental decay. Particularly the sugar in sweets, cakes, and soft drinks.
如何規避這種不好的結果呢？作者給出了理想情況和不切實際的情況的解決方案
Ideally you should keep a tooth brush 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.
最後一小節，普遍性的大家的現狀和壞牙的痛點和進一步突出了這樣做的必要性。
Seven of out ten people loose at least half of 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 a visit to a dentist is very pleasant. So it is worthwhile making an effort to keep you own teeth as long as possible. The main preventative agent is simply water.
問題：
14. According to the passage what kind of food is most likely to cause dental decay?
A) Coca Cola
B) Sausage
C) Milk
D) Fried chicken
15. What does the passage tell us about the condition of Dr. Faustick'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.
16. What does Dr. Faustick suggest to prevent dental decay?
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.
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