First things first, keep your head up. I know how hard this path can be at times, and if this is something that you are truly passionate about, you just need to keep working hard and keep your eyes set on your ultimate goal of becoming a dentist. You scored reasonably well for not taking either of those courses, so I applaud you for that. My best advice would be to take the classes to gain a strong foundation on the subjects, especially since many schools require those as pre-requisites. Also, when you do take the test again, I highly recommend Bootcamp as they have videos on all the chemistry topics covered that you will need to do well on the exam. Lastly, I just wanted to say I believe in you, I know at the moment you may feel discouraged, but in several years all your hard work will pay off. Feel free to message me if you have any more questions. I'd be glad to help!