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Mouth ulcer is an extreme painful condition that can appear on the tongue, the lips, and the gums or inside the cheeks. The first sign of the sore may be burning sensation inside the mouth. They can occur either singly or in clusters. They are usually yellow in color, surrounded by red halos. Normally they heal within 7 to 10 days.
Causes:
Nutritional deficiencies such as iron, vitamins, especially B12 and C
Biting the cheek
Poor oral hygiene
Food allergies
Stress
Hormonal imbalance
Indigestion
