5. Modify your diet.
There are certain foods and drinks that are known to aggravate a canker sore. As we already mentioned, foods and drinks that have high acidity will make a canker sore more painful, so avoid thinks like oranges, lemonade, and any other citrus food or drink.
Rough foods can also irritate a sore, increasing the pain, so avoid anything abrasive, such as toast or chips. Salt and spicy foods and ingredients can aggravate a cold sore, too.
If you eat or drink any of these foods or beverages, you will surely anger your canker sore.