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Mouth ulcers are tiny breaks in the lining of the mouth or on the tongue that form painful flat sores. Theyâre thought to be caused by a virus. They mainly occur when your child has been ill or tired, as well as during stressful times. These types of ulcers are often referred to as âaphthous ulcersâ or âcanker soresâ.
The causes of mouth ulcers are numerous though most commonly they're caused some kind of self-inflicted mouth injury such as biting the inside of the cheek. Here are some other causes of mouth ulcers: Food allergies. Eating acidic fruit such as oranges, tomatoes and pineapples. Viral/bacterial infections.