I went to Dr. Nelson years ago for a root planing procedure. A few days later, the porcelain from the back of one of my crowns fell off, which I believe was due to the way he performed the cleaning. He denied responsibility, so I had to pay to have a new crown (but not through his office).
Worse, I felt the "treatment plan" he put together for me was very aggressive and carried a price tag that one would normally see on a new car.
I suggest you don't have Dr. Nelson do any work until you get a second opinion. Even then, I would never go back there.