Many dentists ago for me but they got a new contraption that could measure enamel thickness. They waved this wand around in my mouth and told me that I was in need of (4) fillings. Now I have always had thin enamel so it's not unusual to need some fillings but I didn't trust this process at all so I told them I'd mull it over and call back. Waited 6 months for next cleaning and mysteriously I didn't need any fillings at all despite having no work done.
I don't think it is necessarily done intentionally, but it's good to be a tiny bit skeptical especially when new factors are involved.
Similar experience here. I went to a new dentist who had one of those machines and he told me I needed at least nine fillings. I declined and found someone else. Over 16 years and multiple moves/new dentists since then, maybe three of those teeth have actually needed fillings.
I don't think it is necessarily done intentionally, but it's good to be a tiny bit skeptical especially when new factors are involved.