Not dentists as a whole, but one in particular, when I was little my dentist was a sadist that enjoyed poking and prodding my teeth and gums with sharp steel picks until blood flowed like a river, savored drilling into my teeth extra deep to fill cavities that weren't there. Fast forward to a few years ago when my new dentist (a real stand up fella) informed me that there were only about 5% of my actual teeth left. The decision was made to remove them all and have implants installed. The surgeon took out every last fragment and even wisdom teeth I didn't know were still there in one painful morning. That's one entire week I can't remember I was on so much Oxy.