If you feel the need to apply to both programs concurrently you should not be applying to either at this point. You need to get more experience in both fields, if in fact you are interested in both. If you're only interested in medicine stick with that. You won't be happy doing dentistry if you really wanted to do medicine. They are completely different professions. Everytime you go to work you may wish you had followed through on your true aspiration. It's not fair to yourself or your future patients. They deserve doctors who are passionate about medicine/dentistry. I've seen these physicians/dentists who don't really like the work they do. They're unhappy, angry, and resentful towards their patients. Don't wind up like that. This is the rest of your life we're talking about. Do the research.
Many pre-meds/dents think medical school and dental school are very similar. This is not true. Yes, we take similar basic science classes but each program goes into greater depth in certain areas. Dental students don't do nearly the amount of systemic path and pharm that med students do, and med students don't do nearly the amount of oral path, oral and head radiology, and laboratory work that dental students do. As a dental student you will spend thousands (yes, thousands. no joke) of hours doing labwork: cutting preps, fabricating gold crowns, pouring up casts, waxing teeth, making dentures, rpds, bridges, etc... Furthermore the last 2 years of dental school are pure patient treatment. It's not like clinical rotations in medical school. It's just you and the patient, doing dentistry. In medical rotations you are part of a team involving attendings, residents, interns, and med students.
My point it to do either program without being passionate about it is a recipe for disaster. Each one is too rigorous to maintain the motivation necessary to succeed and remain sane unless you love it. Frankly, you will hate your life.
There are plenty of ways to make money. Get a job in sales, become a realtor, go to law school (you'll still be miserable but you'll get out a year sooner and make more $), importer/exporter...or maybe you just want to focus on the exporting? That's a Seinfeld reference, fyi.
Don't rush into it. There's no hurry to start practicing. I'm sure many people in med/dental school would have happily taken a little more time to enjoy those wonderful early 20s.
Take care and good luck.