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I have a root canal filling in one of my teeth. The tooth is changing color. Can anything be done about it?
我有一顆牙在牙根管里補過?，F在這顆牙變了顏色，有什么辦法可以解決？
Sometimes a tooth with a root canal filling will change color.
牙根管補過的牙有時會變色。
I can treat it by bleaching it with superoxol (30%H2O2).
我可以用30%的過氧化氫液來漂白牙齒。
If the crown of the tooth is weak it would be better to make a porcelain, acrylic, or ceramic crown.
假如牙冠薄弱，那么還是做上瓷的、透明合成樹脂的或者是烤瓷的牙冠。
If the crown of the tooth is strong, I'd rather bleach it. Bleaching a tooth isn't very difficult.
假如牙齒結實的話，還是漂白好。漂白牙齒并不困難。
What is the first step, Doctor?
醫生，第一步怎么做？
The first step is to remove all of the old filling.
第一步先把所有的填補物都挖掉。
A rubber dam is needed to prevent the superoxol from burning the gingival.
需要做個橡皮障免得牙齦被燒傷了。
How is the superoxol applied?
怎樣使用30%的過氧化氫液？
The Superoxol is applied to the tooth with a little bit of cotton.
可以用小棉球將30%的過氧化氫液涂到牙齒上。
The bleaching is done by applying heat to the tooth with a hot metal dental instrument.
漂白牙齒要用一種發熱的金屬器械把熱送達牙齒上。
There's no discomfort associated with this technique.
進行這種療法并不會有什么不舒服。
What color does this treatment make the tooth?
治療完了之后牙齒會變成什么顏色。
The tooth might be a very light color after it's bleached.
牙齒經過漂白之后會變得十分亮，
However, it will change to a normal color in less than one week.
但是到了一個多星期之后就會變得與正常的牙齒顏色一樣。
