It is best for the orthodontist to see children by age 7 to advise if treatment is required and when the best time to commence treatment would be. The first permanent molars and incisors have usually come in by that time and crossbites, crowding, and other problems can be evaluated. When treatment is begun early, the orthodontist can guide the growth of the jaw and guide incoming permanent teeth. Early treatment can also regulate the width of the upper and lower dental arches, gain space for permanent teeth, avoid the need for permanent tooth extractions, reduce likelihood of impacted permanent teeth, correct thumb-sucking, and eliminate abnormal swallowing or speech problems. In other words, early treatment can simplify later treatment.

Early evaluation provides both timely detection of problems and greater opportunity for more effective treatment. Prudent intervention guides growth and development, preventing serious problems later. When orthodontic intervention is not necessary, an orthodontist can carefully monitor growth and development and begin treatment when it is ideal.