It's best for the orthodontist to see children by age 7
to advise if orthodontic treatment is required and it is 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, 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.