Gum under tooth swollen
Swelling under a tooth can come from gum inflammation, trapped debris, eruption, or a dental infection that needs examination.
The short answer
Swelling under a tooth can come from gum inflammation, trapped debris, eruption, or a dental infection that needs examination. The cause cannot be identified from the swelling alone.
Where might a lump under a swollen tooth be located?
The lump may be in the gingiva beside the tooth, around a partially erupted wisdom tooth, or near the root of a tooth with decay. Tenderness, pus, bad taste, fever, and pain on biting make infection more concerning.
How can you care for swelling under a tooth until review?
Rinse gently with warm salt water, keep the area clean with a soft brush, and avoid squeezing or puncturing the swelling. A dentist may examine the tooth, test its pulp, check the gums, and take an X-ray.
When does swelling under a tooth need prompt dental care?
Arrange prompt dental care when swelling lasts, returns, drains, or is linked with toothache. Go urgently for facial swelling, fever, reduced mouth opening, or difficulty swallowing or breathing.
What should you ask about the source of swelling under a tooth?
Ask whether the swelling is in the gum or from the tooth root, whether an X-ray is needed, and which treatment removes the cause. Ask what warning signs should prompt urgent review.
Frequently asked questions
Can a swollen gum go away by itself?
It may settle temporarily, but recurrent or persistent swelling needs assessment because the underlying cause may remain.
Does a gum boil always mean an abscess?
A draining bump can be associated with an abscess, but examination and sometimes imaging are needed to confirm the source.
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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.