I have an appointment with my 'dentist' today. = I have a 'dentist' appointment today.
He goes to 'the dentist's' for a check-up every six months.
I saw her at 'the dentist' last week.
(..) - You got screwed. - Oh my God! Oh my God! I know, I know, I'm such an idiot. I guess I should have caught on when she started going to the dentist four and five times a week. I mean, how clean can teeth get? My brother's going through that right now, he's such a mess. How did you get through it? (..)1994 TvShow: Friends Title: The One Where Monica Gets a Roommate Season: 1 Episode 1