So I currently have 4 LOR's (2 dental related, 2 science professors) and I'm set to apply to all the dental schools on my list except Columbia. They require THREE science professors, however, I won't be getting a 3rd science LOR until the end of June at the earliest. Should I submit my application before then and just send my 5th science letter directly to Columbia as soon as I get it? Will they allow this or do they require everything to go through AADSAS (specifically talking about only Columbia)? This is extremely important because I'm one of those students who has a lower than average GPA/sGPA (3.3~) but I plan on smashing the DAT out the ballpark (aiming for a 24 TS based on topscore/qvaultdat/destroyer/etc). Any help would be greatly appreciated.