I am currently shadowing a general dentist in the GTA area. He graduated from the University of Melbourne. He told me that finding a job is very competitive in the GTA area. His principle dentists mentioned that they get around 100-150 applications for an associate position posted online. In addition, there are ups and downs in income from month to month. He only expects to earn around 120K each year. He ends with 400K debt from the Melbourne. After payment of debt and tax, his payment is only around 30K(essentially minimum wage) each year and will be doing so for the next 7-8 years.
Given the fact that saturation of dentists become worse and worse in Canada each year, he said that I should always try my best to get into Canadian dental schools. If I cannot get into Canadian schools, try to apply to US dental schools and leave AUS/Ireland/NZ as the last choice.