Definitely worth an application! Keep in mind that some schools will set individual section hurdle scores for the MCAT, so you'll need to make sure you are above those for the schools you choose to apply to. You may have more luck on the PagingDr forum than on here - if you check out the offers threads from previous years you will see the scores that international students required to gain admission into various schools. Though, most of the reports are from applicants who sat GAMSAT rather than MCAT, so it might be hard for you to compare the two.
International students generally require substantially lower score combinations than domestic students, so you're probably still in with a decent shot with those scores, and there's little to lose by applying anyways. Good luck!
Are you interested in any other health degrees other than oral health e.g. physio, optom, radio ? They also have decent job prospects and are "safer" options than health and med sci, but arguably more challenging to get higher GPAs in (need strong clinical skills). However, GPA isn't as important (not to say it isn't) for Adelaide dent offers, more focused on interview (1st criteria) and UCAT (2nd criteria + 100% interview offer criteria). This may be helpful in your situation.