Check the individual schools' websites and they will tell you when you need to send in additional $$ to the school directly. In addition, they will tell you when to send in another (secondary) application form to the school itself. Sometimes the secondary is downloaded from the school website and sometimes it is mailed to you directly. AADSAS's dental school page has a two line summary for each school's individual requirements. I suggest you start there.
Some schools want more $$ now, some want it later. Either way, finishing the AADSAS application only starts the appliation process. Every school will want additional fees and additional paperwork, some will even want a photo. I suggest you budget appropriately.
