What can I do about my dentist rapping my insurance? Doing more work than needed.

I have never had so much work done on my teeth. I'm pretty sure that my dentist is doing work that isn't necessary. I brush my teeth twice a day and for 4 minutes not just 2. My dentist finds something every time I go for my cleaning. I went in June 2016 to get my teeth cleaned. They said I needed 5 or 6 fillings so I got those filled. Went back in another 6 months which was in December 2016 and they say I need another filling and a crown replaced. I wasn't having any issues with the crown that I know of. I had the tooth filled and the crown replaced now I have more issues going on. I have had issues with the crown since he replaced it. Now I have some kind of infection at the crown site and he wants to do a root canal. I'm scared please help me. I don't want to go back to have anything done by this dentist. I really dot think he can see good enough to be working on anyone. He puts this big rig on his head so he can see better.