勒昂说
Le Han theory
以上为机器翻译结果，长、整句建议使用 人工翻译 。
许多市场定位为有益牙齿健康的无糖口香糖只不过是增加唾液从而有助于清除饭粒而已，勒昂说。
Many sugar-free gums that are marketed as being good for your teeth simply increase saliva flow, which helps to remove food particles, says Leung.
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