If you have coffee-stained teeth, a tooth-bleaching kit can help.
如果你有咖啡染色斑，可用牙齿漂白试剂盒。
To whiten teeth that are stained at a deeper level, talk with your dentist.
如果染色比较深了想洁白，就和你的牙医谈谈吧。
He had smoked for so many years that his teeth were permanently stained yellow.
他吸了那么多年烟，牙齿都被永久地熏黄了。
He had smoked for so many years that his teeth were permanently stained yellow.
他吸了那么多年烟，牙齿都被永久地熏黄了。
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