Swelling on gum behind tooth
A lump behind a tooth may come from inflamed gum, an erupting tooth, trapped food, or a dental infection and needs an examination if it persists.
The short answer
The tissue behind a tooth can swell when plaque or food irritates it, when a wisdom tooth is partly erupting, or when infection drains through the gum.
What is the direct answer?
What does this question mean?
Keep the area clean with gentle brushing and interdental cleaning, and use a cold compress outside the cheek for short periods if sore.
What can you do next?
Arrange prompt dental care for pain, pus, a bad taste, restricted opening, fever, facial swelling, or swelling that does not settle.
When should you seek dental care?
Ask whether the lump is related to a wisdom tooth, a periodontal pocket, or an abscess, and whether an X-ray is needed.
Frequently asked questions
Can the symptom go away on its own?
Some irritation settles when its cause is removed, but persistent, recurrent, or worsening symptoms need diagnosis and treatment.
What will the dentist examine?
The dentist will inspect the tissues, test relevant teeth, check gum measurements or fit where needed, and use imaging when it can clarify the cause.