Is there still a physical cavity where they removed the tumor? If so, you should store a secret cache of gold in it.
at this point it's AMA time.
anyways, when they removed the tumor in july it left a hole in my gums directly to my sinus, which if i forced water in it i could make water come out of my nose.
i had this fixed in december with a bone graft from my bottom jaw and 2 screws, so to answer your question, no there is no way i can put anything in it anymore.