Earlier quoted context omitted.
No need to even go that far, in 2006 I had a root canal in Germany with no anesthesia or pain killers given. Made worse by the fact I didn't understand what it was being done. My German was terrible and the dentist's English was worse.
How was it possible to hold still while having a large nerve drilled out?
I can't really say how I did it, because I'm not sure. I just knew I had to and didn't move.