空中英语教室：20110228 MP3在线课程 Cavities: Going, Going, Gone
Cavities: Going, Going, Gone
New research could make a trip to the dentist less painful
Face it ─ few people joyfully anticipate a trip to the dentist. Time spent in a dentist's chair means discomfort in addition to the possibility of a lecture on how to better care for one's teeth. Dentistry routinely makes people's lists of most-hated professions, but most everyone would agree that a trip to the dentist is a necessary evil. This is especially true when it comes to fixing cavities.To do that, a dentist drills out the decay and fills the tooth with gold or other filling material.
New research, however, may make that process a thing of the past. A new peptide called MSH, which is placed in a gel or thin film and pasted next to a cavity, encourages cells inside the tooth to regrow. A study in mice showed that cavities treated with the gel disappeared in about a month.
The French scientists who performed the study warned, however, that the gel does not prevent cavities. People still need to brush several times a day, floss and use mouthwash to maintain good dental health. Also, it will be years before an MSH gel or film will be approved for use in humans.
面对现实吧──很少人会开心期待看牙医。躺在牙医椅子上的这段时间，除了可能得聆听如何多加保健牙齿的教训外，还会浑身不自在。牙医向来都在民众最讨厌的行业名单中，但几乎每个人都会同意，看牙医是必要之恶， 填补蛀牙洞时更是如此。 补牙时，医生会把蛀牙的部分钻掉，然后填入金或其他填充材料。