Pediatric dentistry specializes in/takes care of the oral health of infant, children and adolescent. This dentistry also treats children with special needs, who are physically and mentally challenged. Pediatric dentistry involves additional study of 3 years (i.e. after 4 years of dental training).This branch of dentistry studies child growth, psychology and development. Such dentists take care of wide variety of dental problems of children e.g. cavity, tooth decay, malocclusion, emergency care, crooked teeth etc.