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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.
Luckily most mouth ulcers are easy to treat. Mouth ulcers are usually temporary, healing on their own within 1 to 2 weeks, and harmless (except for pain and inconvenience). If you get mouth ulcers that last longer than 3 weeks, or they recur regularly, you should seek medical attention as it may be a sign of a more serious problem. Causes of Mouth Ulcers. Mouth ulcers are not contagious.