Actually, I think the OP poses a very good and valid question. I know of a dental student who dropped out after D2 and went into law school, but again she dropped out of law school and married her previous dental school classmate. Now she is degreeless and is working in her husbands office with office work. But I am sure there has to be other opportunities out there, I mean there is plenty of medical students who decide medicine is not for them and decide to pursue other careers rather than procede with a residency, so I am sure there has to be some other options for a Dentist.
Yes, I agree with you it is a good and valid question. I do know of a dentist who was pedodontist and now runs OSHA type courses for individual offices. He had some medical issues that prevented him from performing dentistry. I don't know if he was able to collect on a disability policy, never asked, although I think it's not easy. His wife works and has benefits, so he was able to make the transition pretty smoothly. However, it was not a job he just slipped into. It was one that he brought about. Therefore, no guaranteed income at first.
Some dentists do go on to get law degrees, MBA's, MPH and financial planning certifications. Dentists can also do hygiene. They can teach right off the bat without any additional education. About five years back, I decided to obtain some teaching licenses. In our state, at the time, if you had the courses and credits, you just needed to pass some praxis exams, not difficult, send a small fee, your information and Praxis results to the state education department for review. I obtained K-8, high school biology certification and even a provisional early education certification. I even passed the Physics and Chem test too, but the state thought I was lacking a few graduate level physical science credits, 5 to be exact, and gave me the option of taking them to recieve HS physical science certification, but I never felt the need to pursue it. Getting the certs was just some thing I needed to do for me. I started college as an education major and switched my first term freshman year to pre-dent. So, it was an accomplishment to finally have teaching certifications, and who knows what the future will bring. Teaching is a real possibility for anyone with a dental education.
There are a lot of choices dentists can make after dental school, but the OP was very concerned about careers that can support potential dental school debt comfortably. I honestly know of none that a dentist right out of school is better prepared for other than practicing dentistry, regardless of what anyone on this thread has to say. It's just my opinion. Dentists are smart and innovative, they can start businesses, but practicing dentistry may be the most predicable career they can choose to pay off the school loans and live a comfortable life. However, there are always other choices. Practicing dentistry has given me a career and life I really enjoy.