okayy... i use crest 3D whitening strips and it says u see results in three days and for some reason its not whitening all of the teeth mostly the bottom half or less..what am i doing wrong?? everyone thats tried it worked and thier teeth look great and i really want my teeth white. im pretty sure im putting the strips right..so whats the dealio? any tips??pleasee!(: (i already used three strips)(only whitening the bottom half..why) thanks!
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perhaps your stains are not surface stains..but deep dark dirty stains.
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