Periodontitis (periodontology). This is the part of dentistry that deals with the treatment of the supporting structures of the teeth, that is the gingiva, bone, tongue and cheeks. Periodontitis is an infection of the gingiva and bone around the teeth causing irreversible damage to these structures. It is normally a painless infection progressing without any initial symptoms. It is treated by removing the infection with root planning or periodontal open flap surgery. Sometimes a course of antibiotics will also be needed.