A specialization in orthodontics is the study and treatment of improper bites. It is generally carried out for aesthetic purposes. As a student, you will be studying tooth irregularity and disproportionate jaw relationships. Orthodontics residency duration lasts between two to four years. You will be trained to deal and treat children, adolescents and adults. You should look for programs approved by approved by the Commission on Dental Accreditation (CODA).