These whitening strips definitely work but are much slower than other brands. However, I did not experience any sensitivity or pain and my teeth tend to be very sensitive, so I am very happy with the product. Don't expect overnight whitening, but after about a week of use as directed I did notice a small difference. I already had fairly white teeth so those who need more drastic whitening may get better results. I have already ordered a large box on hand and plan to use it about 1-2 times a week. Highly recommended!
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