Swelling on gum behind tooth
A lump behind a tooth may come from inflamed gum, an erupting tooth, trapped food, or a dental infection and needs an examination if it persists.
The short answer
The tissue behind a tooth can swell when plaque or food irritates it, when a wisdom tooth is partly erupting, or when infection drains through the gum.
How should you keep swollen gum behind a tooth clean?
Keep the area clean with gentle brushing and interdental cleaning, and use a cold compress outside the cheek for short periods if sore.
When should swelling behind a tooth receive dental care?
Arrange prompt dental care for pain, pus, a bad taste, restricted opening, fever, facial swelling, or swelling that does not settle.
What should you ask about a lump behind the tooth?
Ask whether the lump is related to a wisdom tooth, a periodontal pocket, or an abscess, and whether an X-ray is needed.
Frequently asked questions
Can the symptom go away on its own?
Some irritation settles when its cause is removed, but persistent, recurrent, or worsening symptoms need diagnosis and treatment.
What will the dentist examine?
The dentist will inspect the tissues, test relevant teeth, check gum measurements or fit where needed, and use imaging when it can clarify the cause.
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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.