Tetracycline is due to the color teeth teeth as a result of, it can be divided into light, medium, heavy three levels, if the love is the teeth of tetracycline mild-moderate donor beauty by the method of cold light teeth whitening teeth to improve the beautiful; If severe tetracycline tooth of words, through the cold light therapy is difficult to achieve very nice teeth whitening effect, and the American dental crown restoration way can moments that make the beauty with white even teeth.

　　原文翻译如下：

　　重度四环素牙应该怎么美白

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　　四环素牙是由于牙齿着色所导致的，它可分为轻、中、重三个层次，如果爱美者是轻中度四环素牙的爱美者可通过冷光牙齿美白的方法来改善牙齿的美观；而要是重度四环素牙的话，通过冷光治疗是很难达到很好的牙齿美白效果的，目前美牙冠修复的方式可以瞬间让爱美者拥有洁白整齐的牙齿。

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