What is the direct answer?
Swollen gum behind a tooth can result from plaque irritation, trapped food, trauma, or inflammation around a partially erupted tooth.
What does this question mean?
The tissue behind the last molar may be the gum over or beside a wisdom tooth, while tissue behind front teeth can be irritated by plaque, brushing, or a sharp edge. Location and nearby tooth condition matter.
What can you do next?
Redness, tenderness, bleeding, bad taste, or limited mouth opening can accompany gum inflammation. A dentist checks the gum pocket, tooth surface, wisdom-tooth position, and sometimes takes a radiograph.
When should you seek dental care?
Arrange a dental visit if swelling persists, recurs, drains, or causes pain. Fever, facial swelling, or difficulty opening the mouth, swallowing, or breathing needs urgent care.
What should you ask the dentist?
Is the swelling around a partially erupted tooth, a gum pocket, decay, or an injury, and do I need a radiograph?
Frequently asked questions
Could this have more than one cause?
The tissue behind the last molar may be the gum over or beside a wisdom tooth, while tissue behind front teeth can be irritated by plaque, brushing, or a sharp edge. Location and nearby tooth condition matter.
What is the practical next step?
Redness, tenderness, bleeding, bad taste, or limited mouth opening can accompany gum inflammation. A dentist checks the gum pocket, tooth surface, wisdom-tooth position, and sometimes takes a radiograph.

