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Mouth sores may be caused by irritation from: 1  A sharp or broken tooth or poorly fitting dentures. 2  Biting your cheek, tongue, or lip. 3  Burning your mouth from hot food or drinks. 4  Braces. Chewing tobacco.
My husband gets painful canker sores all the time in his mouth. What's the deal? Thanks, Brittany. Canker sores are small ulcers that develop in the soft tissues of the mouth. They can appear under the tongue, inside the cheeks or lips and at the base of the gums. Doctors donât know exactly what causes canker sores, but they do know there are a number of contributing factors. 1  These include: 2  Having a weakened immune system. 3  Poor nutrition or vitamin deficiencies. 4  Minor injuries to the mouth. 5  Hormones. 6  Even using some toothpastes or mouth washes that contain sodium lauryl sulfate.