Tooth sensitive when flossing
Sensitivity during flossing can come from exposed dentine, gum inflammation, decay, or forceful cleaning between teeth.
The short answer
A tooth that is sensitive when flossing may have inflamed gums, exposed dentine, decay between teeth, or a flossing technique that is injuring the gum. Sensitivity isolated to one tooth deserves an examination rather than repeated avoidance of that space.
What is the direct answer?
What does this question mean?
Floss passes through the contact point and cleans the interdental surface below it. If dentine is exposed, fluid movement in its tubules can stimulate the pulp, while inflamed gingiva can bleed or feel tender when touched.
What can you do next?
Use a gentle sawing motion to pass the floss through the contact, then curve it around each tooth and slide below the gum edge without snapping. A desensitising fluoride toothpaste may help exposed dentine, but persistent one-tooth sensitivity needs assessment.
When should you seek dental care?
See a dentist for sensitivity that persists, worsens, occurs without flossing, or is triggered by cold, heat, or biting. Prompt care is needed with swelling, a bad taste, a broken filling, or spontaneous throbbing pain.
What should you ask the dentist?
Ask whether the cause is gum inflammation, recession, a cavity, a cracked tooth, or a defective restoration. Ask whether fluoride treatment, a filling, gum care, or a pulp evaluation is indicated.
Frequently asked questions
Should I stop flossing the sensitive gap?
Clean it gently rather than abandoning it, unless a dentist gives different instructions after finding a specific problem.
Can flossing reveal a cavity?
Yes. Decay between teeth may make one contact painful or sensitive when the area is cleaned.