I suggest neither to be honest.. you can whiten your smile more natural ways.. I did a paper on teeth whitening and if you look up more natural ways you will be happier and your teeth will be healthier because all that britesmile and zoom stuff removes enamel from your teeth and no matter how white they are that doesn't mean they are healthy. Try getting a whitening toothpaste.. i reccomened vivid white, and vivid white night.. also brush good and look up different ways .. its easy to find.
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