Actually, Canadian dental schools are not ADA/CODA accredited. They are CDA/CDAC (Commission on Dental Accreditation of Canada) accredited. CODA in the US just accepts Canadian programs as equivalents through a reciprical agreement with the CDAC.
In the future CODA may also develop the same reciprical agreement with the ADC/DCNZ which accredits all dental schools in Australia and New Zealand.
"I don't foresee any significant movement of international dentists, except in Australia and New Zealand, who have programs much like those in the United States. CODA could conceivably develop reciprocal agreements in those countries."
- CODA Vice Chair James R. Cole II, DDS