I gave 2 stars instead of 1 because I noticed a small, very small difference in lightening, but a low rating because it didn't even come close to matching the difference between the before and after photos, that I saw in the ad and not worth paying more than $12 for 4 ounces. Also, reading other reviews and looking at my enamel and gums, I am concerned that they have removed some of my enamel as it seems to be thinner and that my gums have also receded. I would only recommend a one off quick and very light whitening if you have large teeth.
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