I have been using Gentle Formula Crest Whitestrips for 4 weeks and the results were even better than after 2 weeks. I will say that by the end of the 4th week my teeth got a little sensitive but not at all unbearable. Let's see how long the results last! I'm sensitive to whitening strips, but this gentle formula doesn't bother me. I'm pleased with the results, AMD will be doing a second 2 week procedure to see if there is any further improvement.
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