BDS

Hi
If you are looking for PR in Canada, a diploma in dental hygiene will be the best way as u already have BDS. Just check the requirement for licensing at:
https://ndeb-bned.ca/en/requirements

Yeah, you can do M.Sc after BDS. But it won't give you any extra advantage or it won't add up to your career. Better to go for post graduation in Dental.

The scope for students who have done their BDS course is very high nowadays. This is applicable in terms of both employment opportunities a well as higher education. Higher education in this field is the basis required for a person to get lucrative jobs with hospitals or other health care institutions.

All BDS colleges in India admit students through common entrance examinations. However private colleges have management quota. Contact the colleges directly.

NEET Phase 1 expected cutoff for admission into MBBS BDS in general category is 500+. So your chances are low. Appear for NEET Stage 2.
All the best. Feel free to revert.

In India its not possible. If you want to persue MBBS then you have to qualify the entrance and begin from very first year. Being a BDS graduate won't give you any extra advantage in MBBS entrance.