I looked at hundreds of web sites on teeth whitening. Professionalteethwhitening.com was so impressive to me and I really liked their Service. It was apparent to me they knew what they were doing and that the Service was good. But I called to talk with them anyway (skeptic, remember). The person that I spoke to was very knowledgeable and helpful. But the best thing was that their Service was 1/2 of the price at my dentist – and it was the same thing!