this review title is: did not work for me and the content is: i used this device for two weeks and did not notice any difference at all except for the light feeling in my wallet every time i used this i could only think of those quack ads from the s promoting various electrical devices as a cure for whatever disease you happened to have maybe i just had a bad attitude about it i do not know i any case i decided to return it and get my money back i now use a whitening toothpaste from crest and have seen some improvement from that at of the cost.there are other information for this review, one is this reviewer did purchase it and the other is 1 people think this review is helpful.