我们的防龋牙膏有保质期。
牙膏并不清洁牙齿，他们只是含有特殊物质预防龋坏，控制菌斑，增白，保护牙龈或者保护改善牙齿过敏。
Toothpastes don't just clean teeth anymore. They have special ingredients for preventing decay, plaque control, tartar control, whitening, gum care or helping sensitive teeth.
大多数牙膏含氟，氟是可以防龋的。
Most toothpastes contain fluoride, which has been proven to prevent cavities.
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