Comment by d--b

The only people who realize that are the people who move often, hence changing dentists every couple of years. Most people use the same dentist all their lives, not realizing that the way that particular dentist does thing is unique to himself. And on the other side of the equation, there's the dentist who mostly sees the same patients over and over again, and applies the same little tricks he knows, and taking any good result as success and any bad result as "it happens".

But god, it's so true. According to the latest dentist you'll see, everyone who's seen you before has done a terrible job. They're worse than plumbers...