This doctor took me on an emergency basis and stayed until after 9:00 pm ! He was truly caring and concerned enough for the pain and suffering I was experiencing. He has some of the most advanced tools and equipment in the industry and is highly skilled. I strongly recommend Dr. Riehm to anyone in need of a root canal. Do NOT trust a root canal to a general practitioner. Trust me on this one. The procedure I had done by Dr Riehm was a RE-treatment of a root canal I had had done by a regular dentist 5 years ago.