I had the worse possible experience with Mongrain when he filled a tooth that subsequently led to needing a root canal. Which would've been fine except, Unfortunately for me, I had the tooth worked on a Friday before a holiday weekend & even though he was on all, he was not very compassionate in helping me by answering phone calls, deal with the pain until I could see an endodontist. Anyone who has ever had a tooth nerve pain knows exactly what i am talking about! I would not walk away from opening my mouth to this dentist but run. There are plenty of competent dentists in Tulsa & he is not one of them.