This is the first set I've used, suggested by a friend. It took about 2 weeks of using it almost every other day before I really started to see a difference. I am shocked that I can have really white teeth and not have to pay for an arm or a leg. I haven't had any issues with sores or hypersensitivity, but I'm not that sensitive to begin with. It seems that there is a lot of product and it will take a while. I've been using it for 2 months now and just started my second shot.
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