Oral diseases are one of the more common non-communicable health diseases. They pose a major health burden for many countries and affect people throughout their lifetime causing pain, discomfort, disfigurement, and even death. As per WHO, it is estimated that oral diseases affect nearly 3.5 billion people globally. In developing countries, the estimate could be still higher owing to the lack of awareness among the general public, the lack of adequate infrastructure, and less accessibility to oral health care providers, especially amongst people of lower socio-economic status. The aim of this book is to provide an overview of various oral diseases with emphasis on the pathogenesis, investigation, and the management protocol of different oral and maxillofacial diseases.