I will just give my own knowledge here...I'm a dental hygienist and have been practicing for 8 years. I did some light assisting/helping around an office before then. I've basically been in the dental field for 11 years now. I wanted to be a dentist back then but didn't want to commit myself to the length of schooling. Anyway, when I decided to go back I thought I would try to get accepted without my bachelor's degree as well. I knew it wasn't a requirement but "highly recommended." (I have 2 young children and am working as well so I didn't want to have to do more than necessary if I could get in with just the prerequisites.) I started taking all my prerequisites and was lucky enough to land a research spot in my dental school with a professor who turned out to be the head of the admissions committee. We had several conversations about the process. But the moment I told him I was going to apply and try to get accepted without a bachelor's degree he shut that idea down really fast. Now, let me clarify - I had a ~3.8 overall GPA and science GPA that was pretty close to that. I had/have a strong dental background and it was obvious that I was certain about dentistry. Even still, he pretty much said "It SAYS on our website that a bachelor's degree is not required, but it really is. We USED to be more relaxed about this years ago and let people in without it...like hygienist and such...but then we realized that it took more than that to be successful in dentistry. Also, dentistry has gotten SO competitive in the last 5+ years that you essentially NEED your bachelor's to even be considered a competitive applicant. So...you'll need your degree no matter how wonderful you are in other areas."
I say all this not to burst your bubble but to be real with you. The competition these days is so great that having prerequisites, dental experience, high GPA and decent/high DAT really doesn't cut it. I had all of that and was still told that I'd need to complete my degree or not to bother applying.
Turned out that even after 4 years of full time school and having all prerequisites completed, it was still going to take me another 2 years to complete my biology degree and I would have had to quit my job to take the classes (due to the way they were offered). Big time dilemma! I dug a little deeper...found out that by transferring to another school I could finish a "BA in General Studies" by this spring so that I could apply this cycle (an extremely odd degree considering all the classes I've taken)...but nonetheless, I was accepted to the one school I applied to. It's a conditional acceptance, meaning that I have to complete my degree before I begin or my acceptance will be rescinded.
Sorry for the long winded story. My point is that even the "best of the best" applicants are pretty much required to complete a bachelor's degree. I personally would not plan my schedule with the assumption of getting in with just prerequisites. I'd advise you to take classes as if you're working toward your degree. This way, if you get an acceptance and they require you to complete it before entering dental school, you'll already be on track.
Good luck!