I rescheduled my DAT three times, all in different states too!! All in a three week period. Dental school won't know if you've rescheduled it but if you're application is already in and all they need is your DAT score, then taking a later date DAT would just make your application more late, that's the way I saw it. Applying early is a big advantage. My Pre-dent counselor told me not to take it after August because it would be a bit too late (some schools don't even look at completed applications after September b/c they sent out a lot of the interviews already. If you're willing to pay the $25 dollar rescheduling fee each time, then you can reschedule as much as you like, just make sure its 2 business days before your exam.