they usually call 8-10 students every day and there interview ratio is !0:1, means for 10 seats they call more than 100 students.
Interview process in not a big deal, 3 different people take one on one interview and they usually ask questions about yr personal dental experience, yr hobby, where else you going for an interview, why u selected UMN, negative and positive things about you.
I never figured out what they are looking id a candidate to accept, when I had my interview out of 8 students 1 got selected and that student was not happy with the way she presented herself and she was surprised.
So just give your best try and don't stress yourself.
Good luck!!