Simply put, Moses Han went blind because he didn't have the $1,300 to fix an infected tooth. The infection eventually caused him to lose his sight.
Dental care is not included in Canada's medicare system so provincial health insurance does not cover it. There are some options for treatment. For those on social assistance and the Ontario Disability Support Program, there's basic coverage, but no preventative treatment.
I have long wondered why basic dental care is not covered by the public health care system; especially for those who can't afford it and have no private insurance. An infection can not only cause blindness, but other major problems such as affecting cardiac function. Preventative treatment could save a lot of money in the long run.
Canadian citizens should not have their health compromised due to major dental problems.