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Dental schooling to become an oral surgeon will take an additional four years, during which time dental students complete coursework and treat patients in a supervised setting; to become licensed as an oral surgeon, most states require passing a written and practical examination.
For more information on specific medical residency programs, see the American Medical Association's Fellowship and Residency Electronic Interactive Database. Dental residencies for general practice, known as GPRs, are generally one year, with a possibility of a second year at some facilities. Dental specialties, such as orthodontics, require 2-4 years, while oral and maxillofacial surgery requires 4-6 years.