The terms “canker sore” and “cold sore” are often used interchangeably, but they are not the same. Learn the signs and symptoms of each and find out which type is contagious.
source
http://kianorshahmohammadi.com/post/152571010800
source
http://dentaleconomicsus.blogspot.com/2016/10/which-is-contagious-your-canker-sore-or.html
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