i have been using crest whitening expressions toothpaste, and my teeth have been getting whiter except for my eye teeth. they are still discolored..why does this happen? how can i fix this?
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An easy way to fix that is to get a whitening kit that contains a pen like applicator. Then you only have to apply it to the specific teeth you want whitened. The strips are ok if you want to whiten everything but if one tooth isn't keeping up this is your best bet.
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