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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.
The minimum is usually 3-4 years, and it is usually 6 years for those who opt to do a combined M.D. + specialty training in OMFS. In the US, Maxillofacial surgeons have to do 4 years of dental school, then 4 or 6 years for OMFS, depending on the program (2 extra years in general surgery and med school).