Even the most careful brushing reaches only three-fifths of all tooth surfaces.And dental floss can go where no brush has gone before: between teeth, along the gumline.

 
  • 因为即使最认真地刷牙也只能刷到所有牙齿表面的五分之三,而牙线能够到达牙刷从没到过的地方:牙缝和牙龈线附近。
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