"It has been recommended that kids undergo an orthodontic exam by age 7
One reason for the need for early diagnosis is that it takes an expert to determine whether a child has a serious orthodontic problem or if the condition is just a normal developmental variation.
Another reason is that with advanced detection, treatments may be easier if caught early, and may even prevent oral surgery if diagnosed later on in life.
Orthodontic treatment can be successful at any age — and in older patients,
compliance isn’t usually an issue."