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- Xiya is to compare the shortcomings of pain, to be more blood, washed relatively rough surface of teeth, dental stains calculus of the re-emergence comes more. 洗牙的弊端在于比较痛，会出比较多的血，还有洗后牙齿表面比较粗糙，牙渍牙石的再次出现更加来得快。
- After the stains removed by ultrasonic scaling and sandblasting, 32 teeth were divided into polished and control group randomly,all the teeth were immerged into the extrinsic dental stain solution. 结果:经抛光处理后,牙齿表面的外源性色素附着明显减少,抛光组的白色度值明显低于对照组。
- Conclusion Removing adhesive by low speed microbrasion with carbo-wolfram bur is good for preventing extrinsic dental stain，and it is the best method to remove orthodontic adhesive. 结论 弯机+碳钨钻低速磨除法去除釉质黏结剂最有利于减少牙面着色，为最佳去除釉质黏结剂方法。
- Review on Mechanism of Dental Stain and Stain Removal Methods 天然牙着色机制及清除方法的研究进展
- Keywords Dentifrice Extrinsic dental stain Dental stain index; 关键词牙膏;外源性色斑;色斑指数;
- He vainly tried to mark the defacing stain out. 他试图除去有损外观的污迹，但没有成功。
- I put the shirt in soapy water to soak out the stain. 我将衬衫浸在肥皂水里以去除污渍。
- I scrubbed hard at the stain to see if I could get it off. 我使劲擦这个污迹，看能不能将它去掉。
- I am afraid you must wash out this stain. 恐怕你必须洗掉这个污渍。
- The stain on his shirt is difficult to clean off. 他衬衣上的污点很难去除掉。
- Dental prosthetics involving a bridge or bridges. 用齿桥补牙用一个或多个齿桥进行牙齿修复
- The stains have been washed away. 污点已被洗去。
- I had undergone a major dental operation. 我经受了一次牙科大手术。
- How can I take out the ink stains from my blouse? 我衬衣上的墨水印怎么能洗掉？
- These stains won't come off, I'm afraid. 我看，这些污点去不掉。
- Those grease stains won't wash off. 这些油迹洗不掉。
- I rubbed hard but the stain just wouldn't go. 我使劲擦也擦不掉那污迹。
- These ink stains won't come out (of my dress). (我的连衣裙上的)这些墨水点洗不掉。
- These ink stains won't wash out. 这些墨迹洗不掉。
- Such a man is a stain to humanity. 这种人是人类的耻辱。
