The best thing that you could do is to do well in dental school. Everything builds on what you’ve done before. You will not get into an oral and maxillofacial surgery residency unless you do well in the dental school courses.
In residency, you’ll do fine, no matter what your degree is. First call for trauma always falls on the first year resident. And they do not have medical degrees.
Oral and maxillofacial surgeons have done this well for the last 75-100 years. I will never forget that when I was in dental school, the intern in the neuro ICU at the local Level I trauma center was a second year OMS resident, who did not have a medical degree. And he was exceptional.
If you look at the big-name programs today, they were typically built by single-degree oral and maxillofacial surgeons.
I have posted in a previous thread about the chief that I had during my intern year. He made all the difference for me. He only had a dental degree, but he knew as much medicine as most third-year internal medicine residents.
I would suggest finding a local oral and maxillofacial surgeon in your community who will be your mentor. Seek someone out. It is OK to ask if they will be your mentor.
And you can always PM me if you have questions.