What gets mistaken for a canker sore?
Canker sores are common but might be mistaken for the sores that indicate more serious conditions such as oral cancer, leukoplakia, or oral thrush. If you have a sore that doesn’t heal within two weeks or gets worse, you should consult a doctor for a proper diagnosis. Mouth sores often go away in 10 to 14 days, even if you do not do anything. They sometimes last up to 6 weeks. The following steps can make you feel better: Avoid hot beverages and foods, spicy and salty foods, and citrus.