When should you see a doctor about a mouth sore that does not heal?

Mouth sores may follow a bite, sharp tooth, dental appliance, infection, irritation, dry mouth, or treatment-related inflammation. A sore that remains, returns in the same place, or changes in texture needs examination because the cause may require specific treatment. A non-healing sore is a presentation of several possible problems; it does not by itself prove mouth cancer or tongue cancer.

Note the exact site, colour, border, surface, pain, bleeding, numbness, lump, loose tooth, neck swelling, or change in voice. Tell the clinician about tobacco, alcohol, dental work, medicines, immune problems, and cancer treatment.

Arrange an examination with a dentist or doctor and avoid picking or repeatedly rubbing the area. Use a soft toothbrush, choose gentle foods if chewing hurts, and avoid tobacco, alcohol, and foods that sting the sore. Do not apply household chemicals or unprescribed creams. Take a clear photograph and note changes in size, colour, pain, and bleeding so the clinician can compare the appearance.

Seek urgent care for trouble breathing, rapidly increasing swelling, inability to swallow fluids, uncontrolled bleeding, severe dehydration, or a spreading facial infection. Arrange prompt assessment for a sore with a firm edge, persistent bleeding, numbness, a neck lump, unexplained tooth loosening, or difficulty moving the tongue or jaw. These features determine urgency; the sore alone does not establish a cancer diagnosis.

Ask what could be irritating or causing the sore, whether a dental source needs correction, and whether the area needs a closer examination or sample. Ask how to control pain safely and which changes should prompt an earlier visit. If the sore is on the tongue or has a persistent white patch, ask whether Tongue Cancer or Oral Leukoplakia should be considered.