Review title is Did not work for me. [SEP] 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 1920'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 don't 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 1/50th of the cost.