I'm sad you have to go to the dentist on a Saturday, but your comment about something being "totally wrong in the world" made me smile a little.
I used to see a dentist (whom I liked very much) who did night appointments a couple of times a week, and that was a surreal feeling, because the office building she was in was deserted by that time, and all the lights shut off, and sitting in her chair with nothing but the exam light shining and reflecting off the plate glass windows, I used to think, "She could murder me right now and no one would know.."