Gum behind my molar is swollen
Swelling behind a molar can come from trapped food, gum inflammation, an erupting wisdom tooth, decay, or infection around the tooth.
The short answer
Swelling behind a molar may be caused by trapped food, inflamed gum tissue, a partially erupted wisdom tooth, decay, or an infection.
Which tissue may be swollen behind the last visible molar?
The tissue behind the last visible molar may be the gum over a third molar, the back gum pocket of the second molar, or the cheek lining. Plaque and food can collect there, while pain from the tooth root can also spread to the same area.
What can you do for swelling behind a molar?
Rinse gently with warm water, brush reachable surfaces with a soft brush, and clean between the back teeth without poking the swelling. Do not squeeze it or place aspirin on the gum; use pain medicine only when the label and your health history allow it.
When should swollen gum behind a molar be checked?
Arrange dental care if swelling persists, returns, hurts during chewing, or produces a bad taste or pus. Get urgent help for fever, facial or neck swelling, trouble opening the mouth, swallowing, or breathing.
What could be causing swelling behind your molar?
Ask whether the swelling is over a wisdom tooth, in a gum pocket, or linked to decay, and whether an examination and radiograph can show the source.
Frequently asked questions
Can this be diagnosed from symptoms alone?
No. Similar symptoms can come from different teeth or oral tissues, so an examination and sometimes imaging are needed.
What should I avoid meanwhile?
Do not squeeze it or place aspirin on the gum; use pain medicine only when the label and your health history allow it.
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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.