I have only seen my dentist, oral maxiofacial surgeon, and my primary care physician who is an internal medicine doctor. I did see an oncological surgeon a few years ago who shoved a piece of wood down my throat and made me gag, but lost his practice soon after.
I tried to see an oncology specialist recently but they keep telling me that I need to be diagnosed before they will see me which doesn't make any sense as I had seen one who let me in his office for a diagnosis.