I understand that complication may result from the periodontal surgery, gum grafts, membranes, biologic materials, drugs, or anesthetics. These complications include, but are not limited to post-surgical infections, bleeding, swelling and pain, facial discoloration, transient but on occasion permanent numbness of the jaw, lip, tongue, teeth, chin or gum, jaw joint injuries or associated muscle spasm, transient but on occasion permanent increased tooth looseness, tooth sensitivity to hot, cold, sweet or acidic foods, shrinkage of the gum upon healing resulting in elongation of some teeth and greater spaces between some teeth, cracking or bruising of the corners of the mouth, restricted ability to open the mouth for several days or weeks, impact on speech, allergic reactions, and accidental swallowing of foreign matter. The exact duration of any complications cannot be determined, and they may be irreversible. While it is expected that donated tissues have been tested for infectious disease, there is a remote chance that an infectious material may be present and produce consequences of unknown duration that may be irreversible.