Amen, Gavin.
It's an unfortunate reality that just about nobody can afford to pay for dental school out of pocket; it's just way too steep. The good news is, the student loan well is damned near bottomless. Think of it as borrowing against your future net worth; it's not the most comforting thought, I know, but with the work ethic it sounds like you have, making good on the loans should be no problem.
Also, despite what most people say, it's not impossible to work to earn some money during dental school. If you do it right, it doesn't even have to be painful. The key is to find a source of income that YOU control, and can mold around your school obligations, rather than working on someone else's terms and having to juggle.
In my case, I'm in the National Guard (one weekend a month, and I'm home by 4 which leaves plenty of study time), which is a gold mine if you know how to CYA at the beginning. On top of that, I'm a soccer referee, which in addition to providing $50-$75 for a couple hours' work, it also forces me to get up and run around for a couple hours occasionally. The best part is, it's totally up to me which contracts I accept. I can work as many or as few games as I want.
When it comes to doing it during dental school, working is just like anything else--you can do it, but only if you're smart about it.