Canker Sores – What Are They?
Approximately twenty percent of the population have had canker sores. Showing up on the inside of the mouth only, unlike cold sores, canker sores (also known as aphthous ulcers) are not contagious. Canker sores can often be recognized by their oval shape with a red border, and usually a white, gray or yellow center. Canker sores can be painful, but [...]