When a tooth is lost, both bone and gum tissue compete for the defect space. The gum tissue generates quicker than bone, thus assuming the space. With a membrane placement we can keep the gum tissue from the space, while the bone regenerates. Bone regeneration is often used to rebuild the supporting structures around the teeth which have been destroyed by periodontal disease. Bone surgery may be used to rebuild or reshape bone. Grafts of the patient's bone or artificial bone may be used, as well as special membranes.