The inner economist talks with Russ Roberts. He points out that you are unlikely to say "no" to your dentist in person. You have given up control--deep in a chair (he says "strapped"), mouth open, and so on. But after you leave the dentist, you might not say "yes."
I had an experience like that recently. My dentist thinks I need old fillings re-filled. I said "yes" but I never scheduled the appointment.
In general, I worry that a dentist is like Jiffy Lube. I used to feel that Jiffy Lube always had its employees trained to find things that needed maintenance--that they would never let you walk out with just the oil change that you came in for. I have not been to Jiffy Lube for years, just because it's mentally easier to get an oil change from a mechanic who doesn't always recommend other things that need fixing.
The discussion ranges over many topics. If you haven't read Tyler's book yet, I would suggest reading listening to the podcast first. I think that going straight to the book without first finding out more about Tyler's thought process may be a mistake. By reading about Tyler or listening to him, you will have a better idea what to look for as you are reading the book.