Swollen behind last molar
Swelling behind a last molar often involves an erupting wisdom tooth, trapped food, or infection around the gum flap.
The short answer
Swelling behind a last molar often involves an erupting wisdom tooth, trapped food, or infection around the gum flap. The area may be inflamed even when the tooth itself is not painful.
What is the direct answer?
What does this question mean?
The tissue behind the second molar is called the retromolar gingiva. If a wisdom tooth is partly covered by a gum flap, bacteria and food can collect beneath it, causing pericoronitis with redness, tenderness, swelling, or a bad taste.
What can you do next?
Gently clean the area with a small toothbrush and rinse with warm salt water, without forcing an object under the gum flap. Choose soft foods, avoid smoking, and use a pain medicine only as directed on its label and appropriate for your health history.
When should you seek dental care?
Arrange an examination if swelling lasts, returns, or comes with pain, pus, fever, or difficulty opening your mouth. Seek urgent medical care if swelling spreads into the face or neck, or if swallowing or breathing becomes difficult.
What should you ask the dentist?
Ask whether a wisdom tooth is trapped or partly erupted, whether an X-ray is needed, and whether cleaning, gum-flap treatment, or removal addresses the cause. Ask which pain relief is suitable with your medicines and medical conditions.
Frequently asked questions
Can a wisdom tooth cause swelling without severe pain?
Yes. Inflammation around a partly erupted wisdom tooth can begin with swelling, tenderness, or a bad taste before strong pain develops.
Will the swelling go away permanently by itself?
It may settle temporarily after cleaning, but recurrent swelling can persist when a tooth or gum flap continues to trap debris.