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SCIENCE STUDY

Science of flossing is not strong enough

作者:BY MURRAY WENZEL
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牙线真的有用吗?词数 120 建议阅读时间 5分钟

Do you have good teeth? Some of you may floss (用牙线剔牙) your teeth every day. Dentists say that flossing keeps your teeth strong and healthy.
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