Hey man,
You cannot come to Canada and simply just do the boards and get your DDS if that is what i can get from your message. You have to enrol in a dental school that offers a "qualifying program", where you will spend two years, after which you will get a certificate or a DDS depending where you go, after which you become eligible to take the national dental boards of canada for general licensure. Then after you will have to get provincial licensure, depending where you go.
Application for the qualifying program is VERY competitive as far as i know and NOT all canadian schools offer it. Goodluck.
Jamster