Just a heads up, the first two years of dental school are very heavy on biology. Anatomy, physiology, histology, pathology, etc. You need to be prepared to do a lot of bio, and at a much higher level than undergrad, if and when you get to dental school.
I suggest reevaluating your study habits and taking it from there. Clearly whatever you are doing now in terms of studying is not working. From here on out, you need to get higher grades. I would suggest taking upper level bio courses and rocking them with B+ or higher grades. You don't need to retake classes with a C+, it might make life harder when applying, but if you make up for it with upper division classes, it should be fine.
I got into dental school with a D in Orgo 2, which I never retook. I believe it was overlooked because I went on to get A's in graduate level science courses and went on to graduate with a 3.7 in my Masters program. So it's not impossible to get in with some low grades. But you need to step it up from here on out.