Why is one of my gums inflamed
One inflamed gum is often caused by plaque trapped around a tooth, but food impaction, a rough filling, trauma, a periodontal pocket, or an infection
The short answer
One inflamed gum is often caused by plaque trapped around a tooth, but food impaction, a rough filling, trauma, a periodontal pocket, or an infection near the tooth can produce a similar local swelling.

What is the direct answer?
The brush can support plaque control when its size and bristle contact suit the person’s mouth and technique.
What does this question mean?
Inflamed gingiva may look red, swollen, tender, or bleed when touched. When only one area is involved, the examination focuses on the gum margin, the contact between neighbouring teeth, the tooth surface, the pocket depth, and the pulp and root if symptoms suggest a deeper source.
What can you do next?
Brush gently along the gumline with a soft brush and clean between the affected teeth using floss or an interdental brush that fits without force. Rinse with water after food becomes trapped, and avoid squeezing the swelling or placing irritants on it.
When should you seek dental care?
Arrange a dental examination if the inflammation persists, recurs, bleeds easily, produces pus, or is accompanied by toothache, bad taste, fever, or facial swelling. Urgent care is needed if swelling affects swallowing or breathing.
What should you ask the dentist?
Ask whether plaque, food impaction, calculus, a defective restoration, gum disease, or a tooth-root infection is responsible. Ask whether probing, a bite check, pulp testing, or a radiograph is needed.
Frequently asked questions
Can food trapped between teeth inflame one gum?
Yes. Persistent pressure and bacterial plaque can irritate the interdental papilla and nearby gum.
Why might a gum bump come from the tooth?
An infection from the pulp can drain through tissues near the root and appear as a localized swelling.
Should I stop brushing the area?
Continue gentle cleaning unless a dentist gives different instructions, because leaving plaque in place can prolong inflammation.
