In todays esthetics conscious society there is an increased demand for esthetic treatment. Malocclusion has enormous psychosocial effect on growing and adult patients. Class III patients usually display an anterior crossbite which makes malocclusion obvious to the patients and their parents and can be easily recognized by layman. This social and esthetic awareness increases the number of individuals seeking treatment. Chin cup is an extra oral appliance designed to exert an upward and backward force on the mandible by applying pressure to the chin, thereby preventing forward growth. The modified chin cup appliance has dual effects, forward extension of the maxillo-palatal configuration and backward retraction at the chin cup region of mandible. Orthopedic chin cup appliance and modified chin cup appliance showed significant effects on all components of class III malocclusion in deciduous, preadolescent and adolescent growth period.