I had a very challenging impacted upper third molar. I knew that there were quite a few risks because I'm 46 and it was very close to the nerve, close to the other molar and with deep roots. When Dr. O pulled it, he made an opening into the sinus but this was likely going to happen no matter what. I called and was scheduled an appt the next day. It's healing fine, and I've had no other complications.
I'm very happy with him: technically proficient, not chatty, and a low-key, pleasant chairside manner. I would gladly go back if I ever had anything complicated.