Wisdom teeth

盧梓忠

1.Wisdom teeth are normally the last teeth to appear. This usually happens when people are in their late teen years or early twenties - in other words， when they are older and wiser.

Wisdom teeth are chewing teeth， at the back of the mouth. The third set of chewing teeth， if you have them， are your wisdom teeth.

They can grow into place normally and never cause a problem. But often there is not enough room for them in the mouth. 2. 他們可能會擠別的牙齒。Sometimes they even push sideways through the gums （牙齦）.

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 （除去） is generally advised when wisdom teeth only partly break through the gums. Removal is also advised if 3. there is a chance that poorly placed wisdom teeth will damage other teeth. And removal is called for in cases where fluid （流體） 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 ancient humans probably required more chewing teeth. Life was probably a little harder on the teeth back then， too. 4. 所以多幾顆牙齒有好處。

The removal of wisdom teeth is performed by doctors. They say if removal is advised， the best time to do it is before the teeth cause any problems or pain.

Patients can have general anesthesia （麻醉） during the operation. Or they might choose to have a local painkiller and remain awake. 5. It may depend on the number of the wisdom teeth to be removed.

句子翻譯：

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答案：

1.智齒通常是最后長出的牙齒。

2.They might crowd other teeth.

3.長得不好的智齒會損害到別的牙齒。

4.So it was good to have more.

5.這得取決于移去的智齒的數量。