1)
Nursery school or Kindergarten
2)
Elementary school
3)
Junior or Senior high school
4)Adults
Adults whose jaws are well proportioned
Adults with disproportionate jaws (surgery required)
Others
Maxillofacial disorders which are detected at birth (such as cleft lip or cleft palate, Treacher Collins' Syndrome and Crouzon's syndrome)
Periodontal disease
Decayed teeth
Patients whose teeth will not erupt
An insufficient number of teeth
Teeth which are impacted and buried in the jaw
Supernumeraries
Gaps between teeth
Pronunciation disorders
