Prior to any discussion of interceptive orthodontic treatment, one must have a clear understanding of the general objectives of early orthodontic therapy. It was not too long ago that most clinicians waited until the permanent dentition had erupted before instituting orthodontic therapy. However, the dentist began to realize that most of their patients’ pre-pubertal growth had already taken place, and that orthopedic correction of any skeletal disharmonies was almost impossible to correct.(10) Also, leeway space, which is the difference in width between the deciduous molars and the smaller permanent premolars, could not be utilized after the exfoliation of the deciduous teeth, and any minor anterior crowding that existed could not be easily treated without saving this critical space. (18)(19) These and other considerations almost compelled the clinician to begin treating early, at least during the “mixed dentition.”