Ontario will announce free dental care for low-income seniors in Thursday’s budget, the Canadian Press has learned. Anyone 65 and over in the province making under $19,300 — or $32,300 for couples — would qualify, said senior government sources who were not authorized to speak publicly about the budget item. Preventable dental issues such as gum disease, infections and chronic pain lead to more than 60,000 emergency visits per year — a “significant portion” of which are by seniors, one source said.The program, which will cost nearly $100 million per year, was promised by the Progressive Conservatives in their election platform last year.