Gum behind last molar hurts
Pain behind the last molar can come from an erupting wisdom tooth, trapped food, gum infection, trauma, or a nearby tooth problem.
The short answer
Pain behind the last molar often involves the gum over or beside a wisdom tooth, but decay, trapped food, trauma, or a spreading gum infection can cause similar pain.
What is the direct answer?
What does this question mean?
A partially erupted third molar can leave an operculum, or gum flap, where plaque and food collect. Inflammation there is called pericoronitis; pain may also arise from a cavity in the wisdom tooth or the molar in front, a cracked tooth, or an ulcer from cheek biting.
What can you do next?
Gently clean around the area with a small toothbrush, rinse with warm salt water, and choose soft foods while arranging an examination. Do not force instruments under the gum flap or place aspirin directly on the tissue, because this can injure the mucosa.
When should you seek dental care?
Book prompt care for recurrent pain, swelling, pus, bad taste, fever, or difficulty opening the mouth. Seek urgent help for facial or neck swelling, difficulty swallowing or breathing, or rapidly worsening symptoms.
What should you ask the dentist?
Ask whether the wisdom tooth is erupting normally, whether an X-ray is needed, and whether cleaning, gum treatment, restoration, or removal is appropriate. Ask how the neighboring molar and the opposing tooth will be checked.
Frequently asked questions
Can pain behind a molar be from the molar in front?
Yes. Decay or inflammation in the second molar can be felt behind it, so the dentist checks both teeth and the surrounding gum.
Will a wisdom tooth always need removal?
No. The decision depends on eruption position, disease, function, symptoms, and the findings on examination and imaging.