MDS

Canada does not have any program called as MDS. It's South Asian particularly an Indian concept. you may apply for DDS and requirement is as follows
You must have successfully completed a dentistry degree program and provide copies of your transcripts and your dentistry degree
If your first language is not English (or you have not completed post-secondary education in the English language),you must demonstrate English language proficiency in any case IELTS or TOEFL is mandatory for student coming from non English speaking countries.
You must complete the NDEB Assessment of Fundamental Knowledge examination. Results are forwarded to the Faculty of Dentistry by NDEB. For information and application procedures for this examination, please contact the Canadian National Dental Examining Board. and also check respective institute where you want to apply for more requirement.

You should only be concerned about one program which you are going to pursue. The fee for BDA differs from institute to institute.
Dentistry has a lot of scope globally inclusive India. The thing is that, what are you going to do with BDS later.
The only thing you need to have is a well reputed institution with a high calibre staff (as in pvt colleges) and good patient input in the institute (as in govt colleges).
If you have the hunger to learn the skills . the sky is the limit.
If you are opening a clinic, just read this
Adarsh Padiyar's answer to How much can a fresher dentist earn in India? Is it true that dentists don't have a future?
Well, you can go abroad as well to pursue higher education or else u can give exams prescribed by the country u want to go and continue your practice. This affair can be a bit expensive and gruelling.
So if you want to settle in the USA for whatever reason, there are few states which allow Masters degree for international dentists. But to get into those programs there are no known criteria and also u have to go to every state dental association website then to every university website and check out the programs.
Even after that, those dentists will be allowed to work only in certain states and only the speciality.
If you are looking to go for just studies and then return to India lot of universities have programs like esthetic dentistry and implant dentistry but u will not get a license to practice there in the USA.
All the best!