I had a bone graft done for a front tooth that was removed (currently have an implant in and waiting for the crown). The extraction and bone graft were done at the same time and I was in pain for a few days. The only thing I remember is pieces of what looked like tiny fragments coming out of the extraction site which I believe was normal and stopped after a while. It could be some swelling still from the site where they did the bone graft, I would give it a few weeks and if it still feels uncomfortable, bring it up to your oral surgeon/dentist.