Our anticavity toothpaste has expiration dating.
我们的防龋牙膏有保质期。
For instance, our anticavity toothpaste has expiration dating because over time, the fluoride becomes less available to your teeth.
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. The products don't become harmful at any time, just less effective.
比方说，我们的防蛀牙牙膏有保质期，那是由于工夫长了，外面氟的浓度就降低了。
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