Gum is red around one tooth
Redness around one tooth often comes from a local irritant such as plaque, trapped food, calculus, trauma, or inflammation near that tooth.
The short answer
A gum margin that is red around one tooth usually reflects local plaque, trapped food, calculus, trauma, or inflammation around that tooth. The cause is found by examining the gum, tooth, and bite.
What is the direct answer?
What does this question mean?
The tissue around a tooth includes the gingival margin and the gingival sulcus, the shallow space where the gum meets enamel. One-site redness is more suggestive of a local irritant than a general mouth problem, although periodontal disease can begin around a limited area.
What can you do next?
Brush gently along the gumline with a soft toothbrush and clean between that tooth and its neighbour. Do not snap floss into the gum; slide it against each tooth, and arrange an examination if the redness does not settle.
When should you seek dental care?
See a dentist promptly if the area bleeds repeatedly, becomes swollen or painful, drains pus, or the tooth feels loose. Facial swelling, fever, or difficulty swallowing needs urgent dental or medical attention.
What should you ask the dentist?
Ask whether plaque, calculus, a cavity, a cracked filling, food impaction, or a periodontal pocket is causing the redness. Ask whether an x-ray or professional cleaning is needed.
Frequently asked questions
Should I stop brushing that spot?
No. Gentle cleaning helps remove the irritant, but forceful scrubbing can injure the gum.
Can a cavity make the gum red?
Yes. Decay, a rough filling, or food trapped beside a cavity can inflame the adjacent gum.