I would have not even posted this question up with such detail... School can check especially with such few applicants that they are interviewing... I would give up a ski trip for an interview... Thats just my opinion
I would not worry about it, it's just dental school admissions, and if you are good (and it looks like you definitely are) you'll be good regardless of where you go.
a month difference is nothing, if they put you in for an interview, then there will be chance of you being admitted.