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Part four
第四章
An Explanation of Dental Caries
有關齲齒的解釋
Why do I have so many cavities，Doctor?
醫生，為什么我有這么多蛀牙？
It seems that every time I go to the dentist，there are at least three or four new ones.
好像是每次去看醫生至少發現三、兩顆性的蛀牙。
Many of my fillings have been replaced two or three times.
我補過的牙有好些還重補過兩三次。
Your teeth are very susceptible to decay.
你是容易患蛀牙的。
The reasons for increased caries susceptibility in certain patients aren't fully understood by dental scientists.
牙科醫學家們還完全弄清楚某些病人易患蛀牙的原因。
There are many complicated factors involved in the formation of dental caries.
造成蛀牙有許多復雜的原因。
Can you give me an example，Doctor?
醫生， 你舉例說明吧。
Heredity，prenatal development and diet are some of the factors that are important.
遺傳，出身前的發育狀況和食物都是重要的因素。
The body chemistry of an individual and particularly of the mouth and saliva are also important.
每一個人本身的化學反應， 特別是口腔和唾液的化學反應也是重要的因素。
What is the most important?
重要的因素是什么？
The most important and practical thing for you to know about tooth decay is that it's caused by bacteria.
對于造成蛀牙所應知道的最重要的，最實際的一點就是蛀牙是細菌造成的。
You can control the oral bacteria with daily home care.
你可以通過日常的保護來控制口腔的細菌。
If you remove the bacteria from your teeth by effective toothbrushing and dental flossing, you'll reduce the number of new cavities.
假如你刷牙刷得有效，牙線使用的有效，就可以使細菌影響減小，這樣蛀牙就會少。
Is it possible to stop having new cavities?
不再出現蛀牙有可能嗎？
Yes, you may be able to stop having new cavities.
是的，您有可能阻止新蛀牙的發生。
The bacteria on the teeth use starches and sugars in the foods that you eat to form an acid that dissolves enamel.
附在牙齒上的細菌利用你吃的食物中的淀粉、脂和糖， 把它轉變成為能夠使牙釉質分解的一種酸。
