Periodontal health is an integral part of oral health. Diagnosis and proper treatment of periodontal diseases is an important aspect of healthy and functioning oral cavity. Diagnosis of periodontal diseases can be made only by comprehensive assessment of the periodontium. This book has been written with the aim to present a detailed overview of the most pertinent advances in periodontal diagnosis and focused on the relationship between various diagnostic techniques and their clinical applications. It also gives the comprehensive idea from basic science and fundamental procedures to the latest advanced techniques used for periodontal diagnosis including chair side diagnostic "point of care" kits. This book also elucidates the concepts and innovative models around prospective developments in future with respect to the diagnosis of periodontitis.