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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.
This differs from one country to another. 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). Many surgeons later choose doing extra fellowships in plastic surgery, or other disciplines which are closely related to their field of work.