I think there is coursework at A2, but not at AS. I would have thought for Dentistry that one of the more traditional, academic subjects would be more useful/look better on your application. I know a lot of people applying for Medicine/Dentistry that take History. It acts as a bit of a break from your sciences and is still well respected. Physics is also a strong choice, as it's a science. The others probably aren't so ideal, but if you really didn't want to do History/Physics then you still have the main neccessary subjects I think.