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My advice is that it's most important to be natural, i.e. do not rehearse every answer and try to regurgitate it in an interview. I've been told by former employers that I interview well, so I thought the dental app process would be a breeze. I skimmed the Interview Feedback section before my first interview and thought "I'm set." I choked at the first interview...all those responses I memorized went out the window, and I found myself fumbling for a stored response instead of doing what should have been done, speaking from the heart. As lame as that sounds, I performed the best doing so and the next three interviews all landed me acceptances (the failed interview didn't).
Like what UCSFx2017 said, find a mindset that keeps you calm. My approach was a bit different than his. I just allowed myself to not care going in; if I didn't get in, meh, I'd reapply. I feel that too many pre-health students go WAY overboard on prepping for interviews to the point of anxiety. Skim the questions they ask from the interview feedback and get a general idea of how you'd answer some of the tricky questions. Treat it as any other interview, and demonstrate that you're a qualified student who's genuinely interested in the field, and you'll be just fine.