I had to get a crown replaced recently () and I asked for nitrous.... Drilling out a crown is just awful - so loud and jerky. That is the second crown I have had to have replaced. So much money down the tubes.

Anyway, too late now, but my suggestion would have been ask for nitrous.

and I finally got a good dentist, too. He's a cyclist and has done loaded tours over Sonora and Tioga passes.