What does your GPA have to be to become a dentist?

I finished grade 10 with a total of 41 credits. I received a final mark of 86% in social, 84% in English, 76% in science 10, and 70% in math. So my average is 79% without my other courses like gym, art, fashions and cosmo. In order to become a dentist i need university, and i'm not sure how much my GPA has to be. Also does my GPA have to include my option courses? please help im so confused and i need to begin planning now because i only have 2 years left of high school, thanks :)