Not any risks of using Gelfoam as a dissolving packing after a Septoplasty but I have used small telfa packing, overnight, removing them the first post op day. This combined with a single mattress 4-0 chromic suture through the septum has proven effective for the past 20 years in my practice. The benefit of is the airway is open the very next morning after the Septoplasty because the packing is removed.