This book highlights saliva's remarkable diagnostic potential, as medical science shifts towards personalized and preventive healthcare, salivary diagnostics is gaining momentum for its role in early detection and patient monitoring. This volume delves into the molecular composition of saliva, the physiological and pathological influences on its secretion, and its transformative applications in modern medicine. Ideal for students, clinicians, and researchers, this book opens a window into the evolving world of salivary biomarker research-where the future of non-invasive diagnostics begins.