Functional orthopedic treatment seeks to correct malocclusions and harmonize the shape of the dental arch and oro-facial functions. Conventional orthodontic appliances use mechanical force to alter the position of teeth into a more favorable position. Functional appliances have been used since the 1930s. Despite this relatively long history, there continues to be much confusion relating to their use, method of appliances alter the arrangement of various muscle groups that influence the function and position of the mandible in order to trasmit forces to the dentition and the basal bone. Typically these muscular forces are generate orthodontic and orthopedic changes. It is important to note that functional appliance therapy is to be generally followed by the traditional full banded techniques for optimum results; since they deal more with the gross changes in the intermaxillary relations and arc not designed for precise individual tooth movement.