Periodontitis is a bacterial, plaque-induced disease. 2. Periodontal tissues may be affected simultaneously by inflammatory changes and traumatic changes. 3. Unless a traumatic injury is diagnosed, the occlusion should not be altered as part of the periodontal treatment. There is no place for prophylactic treatment of the occlusion. 4. Occlusal adjustment, occlusal bite splints, orthodontic treatment, and restorative dentistry are all means to treat the occlusion. 5. Occlusal treatment is generally performed after control of the inflammatory periodontal changes by root preparation and oral hygiene. 6. Restorative procedures should be carried out at least one to two months after completion of periodontal surgery. 7. The aim of occlusal therapy should be the establishment and maintenance of stable occlusal relationships and the restoration of an optimal occlusal function.