The nature of periodontal disease; Types of periodontal disease; The aetiology of periodontal disease; The normal periodontium; The gingiva; The periodontal ligament; Alveolar bone; Cementum; Regulation of tissue turnover in the periodontium; The anatomy of periodontal disease; Early gingivitis; Chronic marginal gingivitis; Destructive periodontitis; Microbial factors in the pathogenesis of periodontal disease; Microbial plaque and its significance; The development of plaque and calculus; Plaque ecology and the structure of plaque; What makes plaque pathogenic? Host defences against microbial plaque: Salivary host defence mechanisms; The gingival epithelium; The inflammatory response in periodontal disease; The immunological response in periodontal disease; Mediators: the link between inflammation, immunity, and tissue damage; Tissue damage and disease progression: The initiation and early development of disease; Established periodontal disease; Periodontal breakdown; Disease progression; Other periodontal diseases: Early onset periodontitis; Acute necrotizing ulcerative periodontitis; HIV-related periodontal disease; Gingival recession; Clinical mnanagement of periodontal disease: Principals of periodontal treatment; Methods of treatment; Responses to treatment; Future prospects for the management of periodontal disease