I'm sure the interview for the DO/DMD specific program is going to involve questions about why you want to pursue both medicine and dentistry, yes. If you're not interested I would reach out to Nova and ask if you can just interview for the DMD program instead.
I had that last year, but they never mentioned it in the interview. They only choose candidates at orientation - as per conversation with the dean. So even if you choose to pursue just the DMD degree no further action required in ur end.