We Still Don’t Know What Fundamentally Causes Canker Sores
A canker sore—a painful white ulcer inside the mouth—might be brought on by stress. Or the wrong toothpaste. Or certain foods: tomatoes, peanuts, cinnamon. Or an iron deficiency. Or an allergy. Or a new prescription. Or an underlying autoimmune disease.Even though millions of people suffer from them every year, researchers still don’t know much about what fundamentally causes these sores.



























