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This works! it started to whiten my teeth after 3 days and once I finished 20 strips, I had much whiter teeth. I also have very sensitive gum but it didn`t irritate them at all. I don`t continue using it all year around but if I use one pack for 6 months, it keeps them clean and white.
Also, I have tried dental office products that are so much more expensive, yet it doesn`t work as well as this one. This is the best one that I have used so far!