their intake, if i'm not wrong is only once a year in september (unless you're going there for exchange).

as for the dentistry bit. 4As is really good results academic-wise. as for the other questions about whether you're good enough or your co-curricular etc etc, you won't know unless you try applying. i don't think anybody can give you a direct answer for that. but do note that your personal statement would be something that can help you stand out from the rest of the academically excellent applicants,especially since the intake for dentistry is generally quite small and they tend to have a pool of academically excellent applicants to choose from annually. try to write something honest and personal rather than generic exam-like essays and you should be fine.eg. write about how you love sweets but hate going to the dentist or something. O_o sharing personal stories that the selector can relate to might make your application more memorable than the generic i-hold-1000-posts-in-my-previous-school lists. but that's just my two-cents. it's all up to you. all the best!