Dentistry

You can do some certificate courses like:
Rotary endodontics
Implants

You can become a dental surgeon after completing BDS. You can join in government or private sector or start your own practice.

Please refer to the article in the link for in depth knowledge:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3895699/

The main difference between Bachelor of dental hygiene and Diploma in dental hygiene is after completing Bachelor's course you will be awarded a degree whereas in a diploma course you will end up becoming a diploma holder. A value of a degree is more than a Diploma. Alongside, the amount of knowledge and learning you gain in a degree course is more then a diploma course.

Dear Dr. Madhuri,
You must take the Medical Council of Canada Evaluating Examination (MCCEE) if you want to practice medicine in Canada. For further information on PR and immigration, this is not the right portal, you must check with CIC.

Hi Maitry,
Every country has a list of skilled occupations which are in demand. You have to check these lists to know whether the occupation is listed or not. Australia removed dentistry from the skilled occupation list so I won't recommend. You can therefore opt for Canada or Germany depending on your profile, university requirements and your budget if you are asking for further studies.