I visited Dr. Tehrani several times and every time he had a different hygenist and a different assistant. The only thing which seemed constant in the office was the receptionist.
He did a couple of crowns for me on upper and lower teeth contacting eachother and with the upper crown I had continous pain for about 6 months. The lower crown still bothers me 2 years later.
Needless to say, after that experience I never went back to his office.