Sore in mouth not healing
A mouth sore that does not heal needs dental assessment to identify trauma, infection, inflammation, or another cause.
The short answer
A mouth sore that does not heal needs dental assessment, especially when it persists, enlarges, bleeds, or becomes firm.
What is the direct answer?
What does this question mean?
A sore may be an ulcer, a traumatic wound, a blister, an infection, or an inflamed area. Common triggers include biting, a sharp tooth, a rough filling, denture rubbing, illness, dry mouth, or irritation from tobacco and alcohol, but a persistent lesion needs its own examination.
What can you do next?
Rinse gently with saline, use a soft toothbrush, choose cool soft foods, and avoid picking the area or using concentrated chemicals on it. A dentist inspects the lesion, feels its edges and nearby tissues, checks teeth and appliances for trauma, and may arrange imaging or a small biopsy when the appearance or duration warrants it.
When should you seek dental care?
Book an examination when a sore has not healed within two weeks or keeps returning in the same place. Seek urgent help for difficulty breathing or swallowing, rapidly increasing swelling, uncontrolled bleeding, fever, or inability to drink.
What should you ask the dentist?
Ask what the lesion looks like, whether a tooth or appliance is rubbing it, and whether medication, testing, or referral is needed. Tell the dentist when it started, whether it recurs, and any tobacco, alcohol, medication, or medical changes.
Frequently asked questions
Can a sharp tooth keep a sore open?
Yes. A broken edge, filling, denture, or orthodontic component can repeatedly traumatise the lining until the cause is corrected.
Does every persistent sore mean cancer?
No. Many causes are benign, but a persistent or changing lesion must be examined because appearance alone cannot establish its cause.
Who wrote this page
This library is published by Dental Nation, a licensed dental group practising in the United Arab Emirates. Pages are written and overseen by the same clinical team that treats patients in our clinics, and are held to a fixed editorial standard for safety and accuracy.
This page is patient education, not medical advice, and cannot replace an examination. Anything urgent — facial swelling, trauma, uncontrolled bleeding or severe pain — needs a dentist or emergency care now.