如果你的牙齿间有缝隙，那最好用牙间刷或者单簇牙刷来刷牙缝。

If you have Spaces between teeth, it is best to clean these with an interdental or single-tufted brush.

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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。

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.

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