I traveled out Canada & incurred medical expense in other country - doctor visit ,buying medicines & dental treatment, can these expenses be claimed while filing return?

Yes, you can enter medical expenses incurred outside of Canada, as long as they are eligible expenses within Canada. Here is more info about Medical Expenses from the CRA: https://www.canada.ca/en/revenue-agency/services/forms-publications/publications/rc4065/medical-expe...