Review (5/5): Great product and great price!
So far these things work very well. I don't use them as often as I should, but each time I do, I notice a difference in color. While I'm not prone to teeth sensitivity, these can make my teeth sensitive if I use them twice a day or leave them on too long. However, if I only use them once a day or every other day, there is no teeth sensitivity, and I don't have to worry about drooling with another set of teeth trays ( not fun). I highly recommend these to anyone looking to whiten their teeth, and would recommend over any other OTC teeth whitening kit.