They can even be deadly. Infections of the gums and teeth can release bacteria into the blood system.

VOA: special.2009.03.11

Now, if you were listing the parts of the body, you would list the teeth, you would list the lips, you would list the gums, you would list the tongue, but you wouldn't list the smile.

如果要罗列完成这个动作牵涉到的身体部位,你也许会列举牙齿,嘴唇,你会列举牙龈,舌头,但你不会列举出笑

耶鲁公开课 - 死亡课程节选

And that allows the dentist to improve your gums, which avoids more pain down the road.

从而允许牙医治疗你的牙周炎，避免以后越来越痛。

耶鲁公开课 - 死亡课程节选

The American Dental Association says removal is generally advised when wisdom teeth only partly break through the gums.

VOA: special.2011.08.10