5 ~Tanja Lupp I am so glad that Dr. Cobb introduced me to his teeth whitening treatment, Kor teeth whitening. He was so great in taking the impression of my teeth first and making sure the tray fits me well and then explaining in how to use it properly. Now everyone is complimenting me on how perfect and terrific my smile is and to which dentist I go to- of course I tell them about Dr. Cobb!!!!