My experience so far is with Crest Whitening Strips. It worked but my teeth were sensitive. I used Miracle Teeth Whitener once a day to brush my teeth for a minute. I could tell my teeth were whiter, but not to the extent that the Crest strips were; but if I brushed longer or more often then my results would probably be better. This product did not make my teeth sensitive. You have to be careful when using black powder but it's not so bad that it puts me off using this product.
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