Carol asks…Will crest whitening strips work if I use more than one strip per day?I have crest white strips and the directions say to use them once a day for five minutes for 42 days. I want to know if I could use the strips twice a day instead of just once a day for half the time. Do you think they would be just as effective or more effective?admin answers:My mother did that, and OH NO! She got white spots on her teeth! DO NOT DO IT sweetie!!!Maria asks…Crest two hour whitening strips, can
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