Ulcer bottom of mouth
A mouth-floor ulcer may follow trauma or inflammation, but a persistent or changing lesion needs examination.
The short answer
A mouth ulcer is a break in the lining of the oral mucosa, and the floor of the mouth includes the tissues beneath the tongue. Causes include biting, sharp teeth, burns, aphthous ulcers, infection, and inflammatory disease, while some persistent lesions need further investigation.
How can you protect the sore beneath your tongue?
Avoid tobacco, alcohol-based mouthwashes, sharp foods, and contact with a broken tooth; choose soft foods and rinse gently with salt water. Do not scrape the ulcer or apply household chemicals, and record when it appeared and whether it is changing.
When should a persistent floor-of-mouth ulcer be examined?
See a dentist or doctor if the ulcer lasts beyond the usual healing period, repeatedly returns, becomes hard, enlarges, bleeds, or is associated with a neck lump, unexplained weight loss, or difficulty swallowing. Seek urgent care for airway or swallowing problems.
What should you ask about an ulcer beneath your tongue?
Ask whether a sharp tooth or local trauma explains it, whether the lesion needs examination beyond the mouth, and what signs require review. Ask how pain control and follow-up will be managed if it does not heal.
Frequently asked questions
When should a mouth ulcer be tested?
A lesion that persists, hardens, enlarges, bleeds, or changes should be examined so the clinician can decide whether further testing is needed.
What details help the examination?
Note when it began, what irritates it, whether it is hard or bleeding, and whether it has changed in size or color.
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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.