Years ago, due to a change in insurance plans, I went to my first appointment with a new dentist. I was told I'd need to have a crown put on a tooth. I found it odd that no one cleaned my teeth, but I thought, "I guess they'll do that at the next appointment." When my teeth weren't cleaned during the follow-up appointment, I mentioned this to a co-worker.
"I have that plan, too," he said. "It doesn't cover cleanings."
I'd never heard of this before. People go to the dentist to have their teeth cleaned, after all. If I hadn't needed the crown, would the dentist have just looked in my mouth, said, "Yep, those are teeth," and then walked out?