以下为句子列表:
英文: 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: 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。
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