(Stories of kids and dentists always freak me out a little. When I was five, my family moved, and in the course of finding a new dentist, we tried out one who was just horrible. I got scared and started squirming, and the dentist told his assistant to sit on my legs so that I'd stay still. My mom was sitting right there, and when she saw how panicked I was getting, she made the assistant get off me. We never went back there, but we saw a news story on TV a few years later that he had lost his license because some kids had gotten broken legs from being sat on.)
OMG! That's worse than my story and mine is bad! My mom worked at UConn Health Center (the Univ of Conn's hospital) and sent me to the forking dental students when I was 5 or 6. They once filled a cavity (using the metal crown and the rubber raincoat) and then the teacher said it wasn't good enough so they had to redo it! Take the whole thing out and put it in again! The 2nd time wasn't good enough either. I can't remember how many times they redid it. My dad took me (my parents were divorced, mom made the appointment) and I think we're both still pissed at her for it.