Bubbles-
I wouldnt worry about the interview too much, its straight forward and easy, you will go to a confrence room with one (maybe 2) people from the admissions board and they will ask you a few questions. They will then use your answers to fill out a form that they use for everyone. The questions are things like "why do you want to be a dentsit" and "what do you do to improve your manual dexterity" Nothing hard or too thoughtful.
I dont even think that they read my AADSAS or secondary essays.
After that you will probably have to wait for a little while and then you have a lunch with a couple of first years and then a tour. The entire process is a little unorganized. It seems to me that they are very concerned about their stats for the incoming class, and the people that have been accepted so far have had very high gpa and DAT scores.
I am an undergrad at the UW right now, and UW was my first choice, but after seeing the facilities and how things are run compared to other schools it has dropped down on my list.
DesiDentist is also a good person to talk to
Good luck,
chewie