You probably would have a better chance going for griffith if you have a good GPA first year as you have to do well in the Gamsat as well which I hear is pretty hard to do although not impossible.
That said I wouldn't recommend anyone to go to griffith atm as it is a turbulent time in terms of funding as we are limited till the end of the year for QLD health funding for patients.
If you're interested in dent go for it, I advise against it to most people because it's a long road and stressful and if you aren't really that interested in it there are other ways to make money which may be easier and more rewarding depending on your interests.
If you are really good with your hands and have an interest in it go for it but it you are interested in the idea of being a dentist, don't really know what it involves and aren't great with hand skills maybe think again. Some people just aren't meant to be dentists even if they want to be they can't pick up the hand skills.
I used to think anyone can learn anything with enough practice, which may be true but how well and how much time it takes to learn sometimes is independent of effort. I've seen the keenest people with great theoretical knowledge struggle really badly to get basic co-ordination, and the exact opposite where people who have nfi what is going on be really great with their hands and get good clinical results.