Dentistry is the known evaluation, diagnosis, prevention, and treatment of diseases, disorders and conditions of the soft and hard tissues of the jaw (mandible), the oral cavity, maxillofacial area and the adjacent and associated structures and their impact on the human body.^[1] Dentistry is a part of stomatology. Dentistry is widely considered necessary for complete overall health. Those in the practice of dentistry are known as dentists. Other people aiding in oral health service include dental assistants, dental hygienists, dental technicians, and dental therapists.

Dentistry is that branch of medicine which deals with the study and practice of diagnosis, prevention, and treatment of diseases of the mouth, the maxilla, and the face.

http://en.wikipedia.org/wiki/Dentistry