Outside the healthcare provider realm: dental Consulting, legal consulting, get MBA + work for a big oral products company (Check out Procter & Gamble's Subsidiaries) in product testing, development, etc...
If you really want to make a significant impact on a life go into Oral Maxillofacial Prosthodontics. I attended an open lecture at Columbia and the presenter was an OMFS Pros and the work they do is incredible. Giving people who have lost structures of their face, either from trauma or pathology, their features back so that they can re-enter society and feel welcomed again.
Saving Faces, Changing Lives !