It's best for the orthodontist to see children by age 7 to advise if orthodontic treatment is required and the best time for that patient to be treated. 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 and gain space for permanent teeth. In other words, early treatment can simplify later treatment.