It is the branch of dentistry which deals with the diseases of oral and Para oral structures and provides an understanding of which is essential for diagnosis and for the development of rational treatment. Oral microbiology is the study of the microorganisms of the oral cavity. It is the specialty of dentistry and pathology that deals with the nature, identification, and management of diseases affecting the oral and maxillofacial regions. It is a science that investigates the causes, processes, and effects of these diseases. The practice of oral pathology includes research, diagnosis of diseases using clinical, radiographic, microscopic, biochemical, or other examinations, and management of patients. Oral pathology is a discipline that deals with the study of causation and treatment of oral diseases: diseases of the mouth, jaws and related oral structures like salivary glands, temporomandibular joints etc. The oral pathology can be considered a multi-disciplinary topic- a combination of dentistry and pathology.