This course aims to give information to preserve what appears normal at a specific developmental stage. Students learn the importance of early detection of caries, early recognition and elimination of oral habits that might affect skeletal and dental development, space maintenance in case of an early loss of a decidious teeth, early detection of any supernumerary teeth or structure that interferes with the eruption of permanent teeth. Students gain the ability to correct or reduce the severity of developing malocclusion. These procedures include, early correction of developing anterior crossbite, detection of abnormal labial frenulum that might cause midline diastema, detection and elimination of occlusal interferences, regaining of narrowed space, serial extraction in case of severe crowding and interception of skeletal malrelationships.