I'll try to hit all the points.
You cannot just go from dentistry here, to residency in the US, if it were that easy, I wouldn't be asking the question, the fact is, after finishing here, you have to go back to dental school in the US, for a two year program, which costs about 80k, I'm doing the medicine myself, at PUCMM, and I can go straight to the US if I can match a residency, estomalogy students cannot. This is the reason why I ask, because it is what he wants to do, but he'll have to work here for a few years, to have enough money to coordinate everything to become a licensed dentist in the US, which is his goal.
My godfather's daughter graduated from estamology last year, and the process to be able to practice in the US is a very expensive and convoluted one, from what I've been told.
In a perfect world, most people don't go into medicine for the money, but in our world, almost everyone does, I like to help people, this is why I like medicine, but I have a ton of extended family who are all living in poverty, and while I and my immediate family live in comfort, they're living the real 3rd world life. And I would like to help them, so, to me, and by me to my brother, money will matter.
We're in Santiago, so we won't be going to UCE, PUCMM was the only logical choice in the end. UTESA is a hellhole, and with UASD, I couldn't be sure if I could get to my goals in the time I have allowed myself.
From the info I've gathered from y'all, I'll assume that dentistry is not such a good choice. So I guess it's medicine for him as well.