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What are canker sores? Canker sores (also called aphthous ulcers) are different than fever blisters. They are small, red or white, shallow ulcers occurring on the tongue, soft palate, or inside the lips and cheeks; they do not occur in the roof of the mouth or the gums. They are quite painful, and usually last 5-10 days.
There are a variety of home remedies for canker sores that you can try to help alleviate the pain and speed healing. First a word about what canker sores are. They are small, white or yellow, shallow ulcers found inside the mouth, particularly the inside lip, inside cheek, tongue, gum and even the roof of the mouth. While you have a canker sore, avoid spicy or acidic foods such as tomatoes and orange juice and foods with sharp edges such as potato or tortilla chips and nuts. 2  These may aggravate the ulcer, not to mention giving you a jolt of pain.