Same thing just happened to me. I did, however, switch to a dentist with far better equipment who was able to show me pictures of gaping problems in my molars and I had just spent 6 months dosing myself with diet coke to stay awake while writing up a paper for grad school, so it wasn't terribly shocking.

When I switched dentists three years ago, the new dentist claimed to have found several issues during initial check-in and also said that my wisdom teeth need to be torn out as soon as possible. So I have that experience as well. Although, since then, she never complained about anything even though my flossing routine worsened considerably.