I've had 4 root canals by Dr Chaves, and all 4 of them needed to be re-root canal-ed with in a year. One of the crowns he put on after the root canal was faulty so I need that tooth eventually extracted, so I had tooth #30 extracted Aug 2012 and a top tooth not sure of # it's the 2nd molar on right upper side. They were both so badly pulled I lost a great deal of bone so now I cant get an implant that was planned after the extraction. I have nerve damage in my tongue and lip that from the damage, a bad lisp, and a burning sensation in my mouth which I heard is also from nerve damage. I'm a mess! I now need an oral surgeon to repair all the damage to get me back to normal to get implants Which is big bucks! I have to go through a 4-6 hour surgery and have bone removed from my hip to replace all the bone loss. Mind you I had gone back to show Dr Chaves the problem several times and he said I was fine. He would not admit his fault in this disaster. I have been in pain for 6 months due to Dr. Chaves. I have 2 hole that you would not believe from both these extractions. My oral surgeon said Dr. Chaves could have messed me up anymore if he tried. Don't ever go to the Dentist. He has also over changed me a numerous occasions which I had caught. He is all about money not his patients. He has ruined the past 6 months of my life and more to come since the oral surgeon said I now have permanent nerve damage. So for the rest of my life I will lisp, burn and feel numb in my tongue and lip. Dr. John M. Chaves is a very Bad Dentist.