In orthodontics, there are fads and fashions modified by progress and technological advances.Today’s face conscious society needs more than merely movement of teeth to achieve optimal results. We are dealing with a multisystem environment in which the osseous and neuromuscular components are just as important in the over-all picture as the dental structures. So if we are to make the stable and dramatic three dimensional alterations desired in the dentofacial complex, early growth guidance by functional appliances is essential. Functional appliances represent a positive approach to the treatment of craniofacial imbalance by addressing the underlying cause of the malocclusion, in an effort to maximise the natural potential for corrective growth. In this work on Removable Functional Appliances, every effort has been made to introduce to the readers the more recent work done in this field , particularly in the research area so that the clinician can understand why certain things are done and why they should be tried. The book adopts a diagnostic approach to each case and the subject has been introduced in a logical manner to make it more acceptable and understandable.