Swollen back gum one side
One-sided swelling behind a molar can come from trapped food, gum inflammation, a partially erupted wisdom tooth, decay, or an abscess.
The short answer
Pericoronitis affects gum around a partly erupted tooth, while decay or root infection can swell tissue near a molar. Examination, tooth testing, and sometimes an X-ray identify the source.
What is the direct answer?
What does this question mean?
Rinse gently, clean without digging into the swelling, and avoid hard foods on that side. Do not pop the swelling or apply aspirin or caustic chemicals.
What can you do next?
Seek prompt care for persistent swelling, pain, bad taste, pus, fever, or limited mouth opening. Facial swelling or trouble swallowing or breathing is urgent.
When should you seek dental care?
Ask which tooth or tissue is involved, whether imaging is needed, and whether cleaning, drainage, restoration, or extraction is appropriate.
Frequently asked questions
What is the key point?
Pericoronitis affects gum around a partly erupted tooth, while decay or root infection can swell tissue near a molar. Examination, tooth testing, and sometimes an X-ray identify the source.
What should I avoid?
Seek prompt care for persistent swelling, pain, bad taste, pus, fever, or limited mouth opening. Facial swelling or trouble swallowing or breathing is urgent.