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| Why floss? 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. |
中文意思：
为什么要用牙线？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。 |
以下为相关句子列表(点击查看，可以看对应的解释）：
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