Are there schools that request additional LOEs in their supplemental applications? According to ( http://www.adea.org/dental_education_pathways/aadsas/Applicants/GeneralInstructions/Documents/2010SupplementalTableCompleteList(2).pdf ) it seems like Loma Linda, Maryland and UW request more LOEs when they contact you. Just when you thought dental schools make you jump through enough hoops already...
