Commonly encountered problems.
D000293:Adolescent; D000328:Adult; D002648:Child; D003299:Cooperative Behavior; D003731:Dental Caries / Q000209:etiology; D003812:Dentist-Patient Relations; D006801:Humans; D007049:Iatrogenic Disease; D009042:Motivation; D009971:Orthodontics, Corrective / Q000009:adverse effects*; D009973:Orthodontics, Preventive; D010510:Periodontal Diseases / Q000209:etiology; D012008:Recurrence