This simply means that the bodies own immune cells attack the cells lining the inside of the mouth. It is believed that certain factors such as food allergies also play a role. Some people avoid chocolate, walnuts, or acidic foods as citric acid, tomatoes and vinegar because they seem to trigger the ulcers. There is nothing that will stop canker sores from recurring, however, there are things that can be done to relieve the Discomfort. Two cleansing antiseptic solutions you might try are hydrogen peroxide diluted with water to half strength, and one teaspoon each of salt and baking soda to four ounces of water.
Some individuals also receive relief from eating yogurt with active cultures.
Canker sores are not known to be contagious, you cannot pass them on when kissing your significant other, and a virus or bacteria do not cause them. Canker sores and cold sores share many same features, but they are not the same. Both are painful and often caused by stress. Cold sores can occur in the mouth as well, and the can be passed from one person to another. Studies have shown that for some people there is a connection between canker sores and the foods that they eat.