Dr. Zongker is great. I went to Dr. Zongker for a second opinion. A tooth with a previous root canal (not done by him) was having problems. Another endodontist recommended that I have that tooth's root canal re-done and the one in front of it done as well. Dr. Zongker correctly diagnosed that the first tooth with the existing root canal was cracked and the one in front of it was fine. I would go back to him in a heartbeat if I needed a root canal done, especially in light of the fact that he won't do a root canal if it isn't needed. I think that is what we all want in a dentist is honesty!!