All dentists in the United States undergo four years of undergraduate studies, followed by four years of dental school to qualify as a "Doctor of Dental Surgery" (DDS) or "Doctor of Dental Medicine" (DMD).
All dentists in the United States undergo at least two years of undergraduate studies, but most complete a bachelors degree. This schooling is followed by four years of dental school to qualify as a "Doctor of Dental Surgery" (DDS) or "Doctor of Dental Medicine" (DMD).