I'd say it's possible at all, but not a great idea at any.
You will be entirely dependent on loans anyway, so an extra few thousand won't be an enormous help and may come at a huge cost (time, grades, etc.). If it's experience you're concerned about (lab work, if you're already a hygienist, receptionist, etc.) you'll be getting plenty in dental school. If it's balance you're concerned about (you're a musician and want weekend gigs), see if there's a way you can do what you love on a casual basis where no one is depending on youl
See how you feel after the first semester before you sign a contract...that's the only way you'll know for sure.
It would only make sense if you really love doing it, or you get paid really well for it. (Because having time to relax is important.) But the 1% that had a part time job did not have as much time for social activities.