For many years, oral habits have been the subject of intense discussion and study by dental profession. Certain habits serve as stimuli to normal growth of jaw in infancy and early childhood, but when these habits are carried beyond a particular age these may become major etiologic factors which lead to malformation of dento-facial structures.Habits are the most frequent cause of the malformations mostly seen in the early child hood and mixed dentition stages.The intent of the dissertation is to review oral habits as to their etiology, diagnosis, clinical effects and to present a variety of...