Mouth ulcers, also called canker sores, are small painful sores that appear inside the mouth on the gums, tongue, or inner cheeks. While occasional ulcers are normal, frequent mouth ulcers can signal an underlying health issue. Understanding the causes and taking preventive steps can help keep them away and reduce discomfort. 1 Nutritional Deficiencies Lack of essential vitamins and minerals like Vitamin B12 Iron and Folate can lead to frequent mouth ulcers. These nutrients are important for maintaining oral health and their deficiency makes the tissues in the mouth more prone to ulcers. Eat leafy greens dairy products eggs nuts…