Abstract: A dental appliance promotes the healing of oral tissues, such as bone tissue, cementum, and periodontal ligament destroyed by periodontal disease. The appliance includes a flat piece of elastic material, connected at its two opposing edges to two pieces of a biocompatible membrane. The elastic material has one or more punch holes which allow the material to be fitted around a patient's teeth. The elastic material forms a barrier which protects the area of damaged tissue, and promotes regeneration of that tissue. The elastic seal minimizes intrusion of saliva and bacteria into the diseased area, and it is easily cleaned, thus preventing harmful bacteria from colonizing on the material, and prolonging the time during which the appliance can remain in the mouth. The membrane is held under the patient's gums. Due to the biocompatibility of the membrane, gum tissue becomes attached to the membrane, so that the appliance is firmly held in place for an extended period of time.