American dentists are now warning that you should not buy teeth whiteners or bleaches over the Internet or from other over-the-counter sources without first talking to your dentist or dental hygienist.
American dentists are now warning that you should not buy teeth whiteners or bleaches over the Internet or from other over-the-counter sources without first talking to your dentist or dental hygienist.
美国牙医发出警告，人们不应该在与牙医协商前，通过互联网或者在没有医生处方的情况下购买牙齿美白产品或漂白剂。