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There are different types of mouth sores. They can occur anywhere in the mouth including bottom of the mouth, inner cheeks, gums, lips, and tongue. Mouth sores may be caused by irritation from: A sharp or broken tooth or poorly fitting dentures.
1 A tooth that has not broken through the gum (impacted tooth). 2  Gums may be red, swollen, and sore. 3  The area around this tooth can ache, throb, and be quite painful. 4  Problems with or injury to the nerves in the center of the tooth (pulp), which can be caused by an injury to the face or from grinding or gnashing the teeth.ther reasons for a toothache might include: 1  An infection of or around the tooth (abscess). 2  A tooth that has not broken through the gum (impacted tooth). 3  Problems with or injury to the nerves in the center of the tooth (pulp), which can be caused by an injury to the face or from grinding or gnashing the teeth.