The term 'They Know the Drill' is a phrase that is often used to describe people who are experienced in their field and know exactly what to do. In this crossword, the solution for 8 letters is 'Dentists'. Dentists are professionals who specialize in oral health care and have extensive knowledge of the anatomy of the mouth and teeth. They are highly trained and experienced in the use of drills and other tools to treat cavities, remove plaque, and perform other dental procedures. As such, they are well-versed in the drill and know exactly what to do when it comes to providing dental care.