Gateway to dentistry- NEED HELP

I just wanted to inquire about the gateway entry requirements for the Dentistry Course at a University, first of all in my GCSES I achieved 2 9s in English Language and Literature, 2 8s in Design Technology and Religious Studies, a 7 in Physics, 2 6s in Biology and Math’s ; 2 5s in History and Chemistry and unfortunately I was unable to take Biology and Chemistry at A level, currently my options are Psychology, Physics, Philosophy and Religious Studies and if I achieve the entry requirement for the university can I apply for a gateway year to study Biology/Chemistry so I can enter the Dentistry Course.