Preventive orthodontics: when and why.
D002648:Child; D005792:General Practice, Dental; D006801:Humans; D009972:Orthodontics, Interceptive / Q000379:methods*; D009973:Orthodontics, Preventive / Q000379:methods*; D010155:Palatal Expansion Technique; D013995:Time; D014087:Tooth Movement Techniques / Q000379:methods