Poorly positioned wisdom teeth that bite the buccal mucosa or gums may cause traumatic ulcers in the mouth. 1. The most common ulcerative disease of the mouth is recurrent aphthous ulcers, but this is usually not significantly related to wisdom teeth. 2. If a patient’s wisdom teeth are poorly positioned, they may often bite into nearby gums or mucous membranes, causing traumatic ulcers. More commonly, the wisdom teeth in the upper jaw have buccal obstruction, and patients often bite into the buccal mucosa when biting, damaging the buccal mucosa and causing ulcers. 3. It may also be due to the wisdom teeth in the lower jaw did not erupt or were removed, the wisdom teeth in the upper jaw will continue to elongate, and finally bite the gums of the lower jaw, repeated biting of the gums can lead to breakage of the gums, resulting in the formation of ulcers. For more information, please consult your doctor.