 Use of removable appliances in modern orthodontics is much more limited than in the past due to their various shortcomings.Edward Angle, regarded as the father of American orthodontics, developed many universal fixed active appliances, unifying orthodontic practice.There is a totally different orthodontics approach without extraction and pain, is called functional orthodontics, the functional orthodontic technology is different and called functional appliance, that is an appliance that produces all or part of its effect by altering the position of the mandible/maxilla.