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.
This can't be real. I've had a couple root canal procedures done, and even with local anesthesia, sometimes a jolt of pain comes through. It would be impossible to take, I would think.
If you're getting root canal, because cavity is close to the nerve and your dentist don't want to use amalgamated filling then you will need anesthesia, because the nerves are alive.
[1] It gets a bit complicated with molars, which have multiple nerves, if one nerve dies, you'll still need anesthesia for the remaining ones, and you do need root canal, since you can't save part of the tooth and you do need anesthesia, because the tooth is not completely dead yet.