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。
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