Had a couple of root canals totally painless with him. But he put a filling in one time and I had terrible pain with it for 3 months! I returned to him several times. He had no idea what to do. He said he could refer me this other dentist, but he was out of network, and so he said "I could do a root canal. We could start right now."
That's when I left, knowing he was completely dishonest. He had no idea what the problem was, but he was willing to do $1000-$2000 procedure (incl a crown) right on the spot. I've never been back to him.