The document discusses periodontal disease, its causes and treatment. It notes that periodontal disease involves inflammation and infection of the gums and bone around teeth. If left untreated, it can progress from gingivitis to periodontitis where the tissues and bones that support the teeth are destroyed, potentially leading to tooth loss. The document outlines treatments for periodontal disease including nonsurgical approaches like cleaning and deep root planing as well as surgical procedures. It also discusses dental implants as a treatment option for replacing lost teeth.