applying to dental school advice

Hi everyone! I need some help in deciding my next steps. I’m currently a 19 year old senior in undergrad studying cognitive science but have decided that I really want to become a dentist. I have only two requirements for applying to dental school done, and was wondering if you guys think I should take another year or two in college to finish the requirements or if I should graduate and do some type of program/finish requirements at a community college. I just don’t know if the upper division courses would be available to me if I did the second option. My gpa is not the best so I don’t know if this is even something I should truly pursue. I have no idea where I should go from here, there’s so many things I need to do and don’t know where to start. Thank you!