Canker Sores are caused by a virus but the virus is still not really known.
Although Canker Sores are not Viral or contagious and Canker Sores are auto immune which means that the canker is your body attacking itself.
Some people confuse canker sores with cold sores but they're different from each other.
Canker sores are not caused by the herpes virus while cold sores are caused by the herpes virus and are contagious.
You can get rid of a canker sore by applying baby Orajel or other numbing agent to the canker sore or rinsing your mouth out with salt water or hydrogen peroxide.