'Periodontal Medicine' is a broad term that defines a rapidly emerging branch of Periodontology, focusing on strong relationship between periodontal health or disease and systemic health or disease. There is a two-way relationship in which periodontal disease in an individual may be a powerful influence on an individual's systemic health or disease as well as the more customarily understood role that systemic disease may have in influencing an individual's periodontal health or disease. This book provides a systems-based approach to periodontology and offers a scientific roadmap of the interactions which can lead to periodontal disease.