Pathogenesis and treatment of periodontitis consists of extensive reviews on etiopathogenic factors of periodontal tissue destruction that is associated with microbial dental plaque and the host response elements. This book discusses the modalities of adjunctive treatment. Some of the major issues presented are microbial pathogenic factors of P. gingivalis, the relationship between metabolic syndrome and periodontal disease, management of open gingival embrasures, and laser application in periodontal treatment.