There's URMs getting in with a 2.1 but even then, you'll need to do a postbac. I don't think the math is gonna work out... you might get around 2.7 assuming you get all A's and some schools have a minimum 3.0 GPA requirement. Then shoot for the masters
If dentistry is your dream, go for it. There's a dude who applied SIX times and got in on his sixth try so it is possible, but realistically, a different career is in order.