What Are Canker Sores?

Have you ever had a small, painful sore in your mouth or base of the gums? This is called a canker sore, or “aphthous ulcer”. Unlike cold sores, canker sores are not contagious, they stay inside the mouth, and usually goes away within a few days or weeks. They can show up on the inside of the lips, cheeks, tongue,... read more »