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.
What is the direct answer?
What does this question mean?
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.
What can you do next?
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 dental care?
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 should you ask the dentist?
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?