Hurt my gum while flossing
A flossing injury usually settles with gentle care, but ongoing pain, swelling, or bleeding can indicate a separate gum or tooth problem.
The short answer
If flossing cut or bruised your gum, stop forcing the floss, keep the area clean with gentle brushing, and watch for signs that a tooth or gum problem needs treatment.
How can flossing tear the gum between two teeth?
Snapping floss through a tight contact or pushing it into the papilla can tear the thin gum between teeth. Pain can also come from inflamed gingiva, tartar, a rough filling, decay, or food trapped below the gum edge.
How should you care for a gum injured by flossing?
Rinse gently with water, brush with a soft toothbrush, and return to careful interdental cleaning as tenderness allows. Guide the floss with both hands, curve it around each tooth, and use an interdental brush or water flosser if the contact is difficult to clean.
When does a flossing injury need dental assessment?
Arrange care if pain, bleeding, or swelling does not settle, or if the same spot is repeatedly injured. Seek urgent help when bleeding will not stop with pressure or when facial swelling, fever, or swallowing difficulty develops.
What should your dentist check at the repeatedly injured spot?
Ask whether the tissue is simply traumatised or whether a pocket, cavity, filling margin, or calculus is causing the problem. Ask the dentist to demonstrate a safe cleaning method for that contact.
Frequently asked questions
Should I avoid flossing the sore spot?
Avoid force, but continue gentle plaque removal and ask for an alternative interdental tool if the contact is difficult.
Can a filling make floss cut my gum?
Yes. A rough or overhanging filling can catch floss and irritate the gum until the dentist adjusts it.
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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.