My teeth are oddly healthy despite my constant assault on them with sugar and all sorts of anti-teeth foods. Yes at one time even some rocks (I was a stupid kid...).
Concerning the anesthesia I was put under twice, first for a colonoscopy* and second for an endoscopy. I also had my tonsils taken out when I was really young but piss on counting that, I can't even remember the event. With the butt tube the sleepy meds weren't a problem, it was the bile that they forced you to drink the day before that was god awful. That stuff made me ill just looking at it. The endoscopy wasn't bad either, heck I even requested a bit stronger of a dose.
*Interesting side note, apparently Firefox wants to correct colonoscopy to endoscopy.