a graduate course. You can start undergraduate courses straight after you finish high school. But graduate courses mean that you need to have already done a degree at uni before you start the dentistry course You'd probably need to know a bit of chemistry, biology AND physics, as you would have to do at least a unit of each once you get to Uni. As the other scientists have said, you need to check each Uni's requirements to see what you need. Here is an Australian website about how to become a dentist that you might find helpful: