Dentist!, is a song in the musical Little Shop of Horrors. It is sung by Orin Scrivello, D.D.S to describe how he is a sadist, and that has allowed him to become a successful dentist.
There are roughly one-sh*t billion tropes so PLEASE look through them before adding one. Otherwise add what you like. ADDITION: PLEASE read through the trope description provided before submitting something. It's not a huge deal but too often people submit characters that don't fit just because they misinterpreted the title...