Give you some ideas and let you research them to form your own opinion from there:
-amalgam vs. composite (recently asked at my interview last week)
-medicare/medicaid- should dentists accept it, would you accept it, etc.
-aging generation- elderly keeping their teeth longer, and getting dental care to those in nursing homes. A lot of the meds residents in nursing homes are on cause dry mouth which can be an arena for pathology to develp since there is no saliva there to protect against the diseases.
-w/ everyone drinking bottled water and the lack of flouride in it
Just some ideas I looked into to prepare for my interview.