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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.
The sore on the top of the mouth could be caused by a canker sore. According to the American Academy of Otolaryngology, canker sores on the top of the mouth only appear on the soft palate, not on the hard palate.7 You can also get canker sores on the tongue or inside the lips or cheeks.