Get to take classes with Harvard med students with harvard med school faculty.
What impressed you negatively?
The facilities are ridiculously small and old. I was shocked to see how run down the place was. They spent more time showing us how great the Med school is than the dental school. They have no sim labs. The students have some of the biggest egos I have EVER seen and one told me straight out that after you grad from Harvard you will not have the skills needed to immediately practice clinical dentistry.
What did you wish you had known ahead of time?
That the Harvard dental school is absolutely worthless compared to its med school and other dental schools. You take away the Harvard name and you're left with a mediocre school at best.