It is the science which deals with the function of oral structures. It gives idea about or facial dysfunction which is useful for diagnosis and treatment of disease. Oral health mainly deals with health of teeth and all oral parts. It mainly focuses to prevent dental problems, most commonly, dental cavities, gingivitis, periodontal diseases and bad breath. There are also oral pathologic conditions in which good oral health is required for healing and regeneration of the oral tissues. Dentistry is the branch of medicine that is involved in the study, diagnosis, prevention, and treatment of diseases, disorders and conditions of the oral cavity, commonly in the dentition but also the oral mucosa, and of adjacent and related structures and tissues, particularly in the maxillofacial (jaw and facial) area. Although primarily associated with teeth among the general public, the field of dentistry or dental medicine is thus not limited to odontology.