A few comments:
1) I actually posted a thread similar to this last year:
http://forums.studentdoctor.net/threads/first-educational-pathway-costing-1-million-in-debt.974639/
2) Accruing 500K of debt upon graduation from a private dental school is par for the course now.
http://www.dental.upenn.edu/academic_programs_admissions/dmd_program/tuition_fees
https://dentistry.usc.edu/programs/dds/cost-of-attendance/
If you have even a modest 50K of undergrad loans and attend one of these schools and then complete a GPR, you will have 600K + of debt.
Most new grads make 120K their first year out with no benefits.
3) For dentists to make higher incomes, they need to BUY a practice. That's MORE debt.
4) Most dental residencies charge tuition. UPENN's orthodontic program is about 110K per year COA.
So, if you attend UPENN dental school with 50K of undergrad debt, you will end up owing ~850K of debt if you attend their ortho program afterwards.
Last, my question to all on this thread is this:
If you could not obtain a military scholarship, at what principal borrowed amount would you pursue a different career?