I was considering a route similar to this a few days ago ( I didnt get the grade I neededbut thankfully Dundee hav let me in for Dentistry)
If you apply for dentistry tho, they will quiz you as to why you didn't choose dentistry when you left school, because they're a bit pernickity that way, want you to be obsessed with dentistry and to have walked around with an itsy bitsy mirror in ur hand as opposed to a rattle/soft toy/barbie, but if didn't leave school and go straight into dentistry because of grades then it wouldn't be so hard I don't think.
The only thing to remember is that by the time you'd complete your degree, and ur dentistry course that will be 9 years at uni. Lots of money !! and you won't start working properly till you're about 27 !!!
Not trying to put you off tho !!!
I was told the preferred degree subjects for dentistry are pharmacology, pharmacy, biomedical science, biochemistry and anatomy.
Hope that helps

*~* Pam x x x *~*
P.S Hiya Will !!!! Long time no speak !!!