ccss,
Congrats on your interview at Harvard. I interviewed there last month. The day began with an overview of the school. They will tell you about their problem based learning curriculum, how clinicals are organized, etc. Then you have two back-to-back, one-on-one interviews with members of the adcom. During the interview, they asked me direct questions about my application and questions about myself and my personality. This is followed by lunch at the cafeteria with 3rd and 4th year students and then a tour of the school by 1st and 2nd year students. It was good to talk with the students after the interview, so I could ask them about my interviewers and get a better feel for how my interview went. Also, they were very friendly and honest about the dental school experience. After the tour, the financial aid officer offers an optional session. I recommend attending this session. It was the most informative session I've heard so far and gave me information that I will use wherever I attend dental school.
Overall, I was very impressed with the school. With such a small class size, they can really concentrate on the individual student's needs and ideas. Also, as far as research goes, it seems that everyone can find an area that interests them for their required project. Good luck!
annimul