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.
比如说，我们的防龋齿牙膏有保质期，那是因为时间长了，里面氟的浓度就降低了。
For instance, our anticavity toothpaste has expiration dating because over time, the fluoride becomes less available to your teeth.
乳酸可用作牙膏和其它口腔卫生品的活性物以防龋齿及保持口腔清洁。
Lactic acid can be used as an active ingredient in toothpaste and other oral hygiene products to prevent tooth decay and freshen breath.
乳酸可用作牙膏和其它口腔卫生品的活性物以防龋齿及保持口腔清洁。
Lactic acid can be used as an active ingredient in toothpaste and other oral hygiene products to prevent tooth decay and freshen breath.
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