Bleed when floss
Bleeding during flossing often signals inflamed gum between the teeth, but forceful technique or local injury can also cause it.
The short answer
The pointed gum between two teeth is called the interdental papilla. Plaque at this margin can trigger gingival inflammation, making the tissue bleed when floss touches it; snapping floss into the gum can create a separate mechanical injury.
How should you floss around the gum between teeth?
Guide the floss down one tooth side in a gentle C shape, then clean the other side with a fresh section rather than sawing hard into the papilla. Continue careful daily plaque removal unless a clinician has given different instructions, and use an interdental brush where spaces allow.
When does flossing bleeding need dental assessment?
Seek dental care if bleeding is heavy, spontaneous, persistent despite gentle cleaning, or accompanied by swelling, pus, pain, loose teeth, or easy bruising elsewhere. A dentist can check gum pockets, calculus, medication effects, and local trauma.
When should you seek care for bleeding after flossing?
Ask whether the bleeding site has gingivitis, calculus, a pocket, or a food trap, and which interdental aid fits the space. Ask for a demonstration of pressure and direction around the contact point.
What is the gum triangle between adjacent teeth called?
The gum triangle between adjacent teeth is the interdental papilla.
Frequently asked questions
Gentle cleaning is usually needed to remove plaque, but persistent bleeding deserves an examination rather than increasingly forceful flossing.
Why does one gap bleed but not the others?
Who wrote this page
This library is published by Dental Nation, a licensed dental group practising in the United Arab Emirates. Pages are written and overseen by the same clinical team that treats patients in our clinics, and are held to a fixed editorial standard for safety and accuracy.
This page is patient education, not medical advice, and cannot replace an examination. Anything urgent — facial swelling, trauma, uncontrolled bleeding or severe pain — needs a dentist or emergency care now.