When a tooth is lost, both bone and gum tissue compete for the vacant space. The gum tissue generates more quickly than bone, subsequently occupying the space. With a membrane placement we can keep the gum tissue from invading the space, which will ideally give the bone sufficient time to regenerate. 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 attempt to rebuild or reshape bone. Grafts of the patient's bone or artificial bone may be used, as well as special membranes.