Swollen gum behind back molar
A swollen gum behind a back molar may surround a partially erupted wisdom tooth, trap food, or reflect gum or tooth infection.
The short answer
The tissue behind a last molar is often the gum flap over a partially erupted wisdom tooth. Inflammation there is called pericoronitis, but swelling can also come from decay, a periodontal pocket, trauma, or an abscess in the molar.
How can you care for gum behind a back molar?
Gently clean around the area with a small soft brush, rinse with warm salt water, and avoid chewing hard food on that side. A dentist may irrigate beneath the gum flap, remove trapped debris, treat the tooth, or assess whether wisdom-tooth removal is appropriate.
When should swelling behind a molar be checked?
Arrange dental care if swelling lasts, returns, causes bad taste, pain, reduced mouth opening, or difficulty chewing. Fever, facial swelling, swallowing difficulty, or breathing difficulty needs urgent attention.
What should you ask about swelling behind a molar?
Ask whether the swelling is over a wisdom tooth, whether the molar or gum pocket is infected, and which treatment will prevent repeated episodes.
Could the swelling be linked to a wisdom tooth?
Likely site
Frequently asked questions
No. Squeezing it can injure tissue and spread irritation; examination is needed to identify its source.
Will it always need wisdom-tooth removal?
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.