Unfortunately, HiSmile did not work for me. After completely using the kit in six days, I did not see any difference in my teeth's color. Could be that my teeth are stained more permanently than most, as I've tried other whitening methods and saw limited results. HiSmile did offer me a refund, but I have to pay for $22 shipping so, not that happy.
Bottom Line: No, I would not recommend this to a friend
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