Is a maxillofacial surgeon a dds or md?

Depends: Some of them are both a dds and md. Some are dds with additional specialized training. Either way, it takes many many years to become a maxillofacial surgeon and they are very qualified for what they do.

Can be either: Can be either or both. Some will go to dental school and earn their dds or dmd and then go to a 2-4 year program that will provide their speciality training which may or may not award an md.

Either DDS or DDS MD: Oral and maxillofacial surgeons can be trained as dds or dmd with a dental degree only or dds or dmd ( dental degree) and md (medical degree).

Can be both: All licensed oral surgeons, regardless of degree type (dds or dmd) attend dental school, and several additional years of oral surgery training. In addition, some oral surgeons are dual trained as md/dmd or md/dds. This added background may give them a different perspective when interpreting test results and clinical exams but is not necessary.