Periodontal Medicine is an emerging branch of Periodontology that focuses on the relationships between periodontal health/disease and systemic health/disease. This pioneering approach of periodontal medicine has helped many researchers to renew their attention towards focal infection theory and the relationships between chronic periodontitis and systemic health. Periodontal medicine is an integral part of clinical periodontal research. Research activity in this field has grown immensely since the early 2000's. Better knowledge of this correlation is a crucial step for both dental and medical professionals to render appropriate patient care. This book is an attempt to elaborate several aspects of periodontal medicine that have been highlighted in the recent decades.