The American Association of Orthodontists (AAO) recommends that all children have a check-up with an orthodontic specialist no later than age 7. The reasons for this examination: • The posterior occlusion is established when the first molars erupt. At that time, one can evaluate the antero-posterior and transverse relationships of the occlusion, as well as discover any functional shifts or crossbites. • Incisors have begun to erupt and problems can be detected such as crowdin