在牙齿上的细菌膜名为牙垢。
由于新的多肽中含有阳离子氨基酸残基，所以他们可以和带负电的细菌膜并渗透进去。
As the new peptides contain cationic amino acid residues, they can bond with the negatively charged bacterial membrane and penetrate it.
因为辅食、配方奶里的糖份会形成牙菌斑，清除这层细菌膜对建立一个良好口腔卫生基础非常重要。
That's because sugars in food, milk and formula can form a plaque-like film. Removal of this film is important to promote good oral hygiene at an early age.
咖啡的着色是浅表性的，仅仅影响菌膜——覆盖牙齿和牙龈的一个很薄的细菌层，并不能穿透牙釉质。
Staining from coffee is very superficial, effecting just the biofilm, a thin layer of bacteria which covers the teeth and gums, and doesn't penetrate through the enamel itself.
咖啡的着色是浅表性的，仅仅影响菌膜——覆盖牙齿和牙龈的一个很薄的细菌层，并不能穿透牙釉质。
Staining from coffee is very superficial, effecting just the biofilm, a thin layer of bacteria which covers the teeth and gums, and doesn't penetrate through the enamel itself.
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