Over the last decade there have been revolutionary researches in the field of diagnosis and treatment of oral cancer patients but unfortunately morbidity rate of patient is static over last 30 years. It is paramount that a dental clinician be cognizant of the sometimes subtle and overlooked signs and performs appropriate follow-up care. So, this book provides a guide and a new metric of success for clinicians and researchers in routine practice to provide better health care facilities. We have attempted to provide a comprehensive reference guide to a all recognized diagnostic techniques in early detection of oral cancer and precancer. I hope that you find the information in this book to be interesting, relevant and of practical use.