Something as simple as toothpaste has at least three chemicals that keep your teeth clean.

哪怕像牙膏这种简单的东西也至少有三种化学成分来保持牙齿清洁。

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Patient: I try my best to keep my teeth clean. I hope I don't need any fillings this time.

病人：我尽力保持牙齿清洁。希望这次我不需要补牙。

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That tube of toothpaste you have sitting by the sink does more than just keep your teeth clean, bright and white.

你放在水槽旁边的那管牙膏并不是只能保持牙齿清洁、亮白。

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When baby teeth begin to appear, you can clean them with a wet toothbrush.

VOA: special.2009.03.11

Scotland's chief dental officer, Margie Taylor, urged parents to teach children the importance of keeping their teeth clean and to restrict sweets to meal times as much as possible.

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Businesses, which have included Microsoft, Marriott International and GlaxoSmithKline, create real-world challenges for students to solve, such as: How do you help parents motivate and engage their kids to keep their teeth clean?

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"The whole concept was there within 10 seconds, " says Mr. Gray, who also is working on inventions to prevent shopping cart thefts from supermarkets and to better clean teeth.

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