Read on for everything you need to know. Canker sores are “open sores in the mouth,” says Howard Sobel, M.D., clinical dermatologic surgeon at Lenox Hill Hospital in New York. “They ...

Canker sores are small, painful reddish lesions in the mouth that have a white or yellow center. Some causes of canker sores are spicy/acidic foods, vitamin deficiencies, braces, and stress.

Photo Credit: adamkaz / Getty Images There are many reasons why ... You or your dentist may see the cancer, because it looks like a sore in your mouth that just won’t heal.