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拔除智齿(2)

上传时间:2011-08-14 10:42   录音时长:1分8秒

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  • 发音:
    50
  • 语调:
    50
  • 语速:
    80
  • 流利:
    70
  • 音质:
    60
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资料原文 |

Wisdom teeth that are not well aligned and become impacted are often removed.
People should have the placement of their wisdom teeth examined between the ages of sixteen and twenty.
X-rays can show wisdom teeth that are below the gums.
The American Dental Association says removal is generally advised when wisdom teeth only partly break through the gums.
Removal is also advised if there is a chance that poorly aligned wisdom teeth will damage other teeth.
And removal is called for in cases where fluid collects around a wisdom tooth that is partly or fully below the gum.
But why do we have wisdom teeth if we often need to get them removed?
One theory has to do with our diets. Scientists say the diet of prehistoric humans probably required more chewing teeth.
Life was probably a little rougher on the teeth back then, too.
So it was good to have extras.

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