For SA it was two one-on-one interviews-one with a D3/4 student and another with a faculty member each lasting for about 15 minutes. The interview with the student was as casual as you can get. It was like speed dating or meeting with an old friend for coffee and asking how their life's been..minus the coffee and in a dental room. The one with the falculty was more formal and behind the desk style. They asked generic questions like why dentistry, why you, why our school and questions focusing more on your app and essay. I didn't really practiced much or prepared solid answers..I just winged it lol. I probably could've done better but all in all, make sure you can string together a conversation and speak like a normal human being and you should be fine. Remember if they invited you for an interview, they are confident that you are more than capable of become a dentist, but are you interesting and confident enough to speak like one?