I chose not to look while she took out various grinding and reaming tools; the sound was more intense than just being drilled for a regular filling. The anaesthetic began to wear off before she was done, but that was okay; I certainly wouldn't have wanted to be more numb, considering that my upper lip felt like a slab of rubber for a few hours after anyway.
So I have a temporary cap on it and have to go back next Wednesday for more fun. They also scheduled me to continue with my ongoing treatment—like twelve sessions and a few thousand dollars; I had dropped the ball and canceled an appointment last summer, which is why I ended up with this runaway decay in the first place. Live and learn; at least I get to keep my teeth for now.