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There are many types and causes of mouth sores. Mouth sores may be caused by an infection, a bodywide (systemic) disease, a physical or chemical irritant, or an allergic reaction (see Table: Some Causes of Mouth Sores). Often the cause is unknown.
1 In addition to food or debris caught in the teeth or gums, common causes of a sore tooth include: an infection of the tooth, root, or gums; mouth trauma that causes tooth damage; an emerging crack or split in the tooth; teething (in children); or a sinus infection that causes mouth pain.n abscess is an infection that has spread from a crack in the tooth into the pulp inside. From there, it can spread into the jaw and elsewhere, with possibly serious medical complications. 1  In addition to pain, swelling, fever, redness in the gums, and a foul taste in the mouth can be signs of an abscess.