Your major doesn't matter, but you need to make sure you are taking the required courses for dental school (ie. Organic Chemistry 1 and 2, Biology, etc.). Schools will not allow you to matriculate into the school, without having taken all required courses. There are a lot of them, and the requirements are slightly different at each school (some require an amount of humanities, while some require sociology or psychology). I would check out the ADA website and a few schools that you may be interested in to see what their requirements are, so you can plan to begin taking those classes next semester. You can take a couple of them at a Community College, but I know that some schools don't love classes taken there, so be careful when doing that. Possibly call a few schools before you do this to make sure the credit will be accepted. You can't take the DAT without these foundational classes.
I recommend joining Dr. Romano's DAT Study Group on Facebook. He has lots of videos and resources to determine how to best study for the DAT, then posts daily questions to help you learn concepts for the DAT. This helped me and I am currently in my 2nd year of dental school.
Best of luck to you!