I have been a patient for 32 years. Over the years Dr. D has replaced all my old fillings with newer material; performed a painless root canal (32 years ago, of which I still have the original porcelain crown, and it is still in good shape). No matter where I have lived over the last 32 years, I have always returned to the Houston office for him to take care of my teeth. No one can replace him. His office staff is very friendly and very accommodating. I would not hesitate to recommend Dr. D to anyone.