Periodontitis is a chronic inflammatory degradation of the tissue and bone supporting the teeth. If periodontal disease left untreated often causes irreversible damage to the bone surrounding the teeth. Periodontitis can be mild, moderate or advanced. Fortunately, Mild case of periodontitis can be treated before significant bone and tissue destruction occurs, usually non-surgically. Moderate and Advanced Periodontitis is usually treated surgically which often requires surgical recontouring of the supporting bone to prevent future periodontal disease (Osseous surgery) or may include bone grafting or regeneration.