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Why Do My Gums Bleed When I Brush? 8 Possible Reasons

July 1, 2026  ·  3 min read

Most people have experienced seeing a little blood in the sink when brushing. It happens so frequently that many assume it is normal. It is not. Healthy gums simply do not bleed in response to toothbrushing. Here are the eight most common reasons gums bleed — and what you can do about each one.

1. Gingivitis (the most common cause)

Gingivitis is inflammation of the gum tissue caused by plaque buildup along the gumline. The inflamed tissue becomes swollen with extra blood vessels and bleeds easily at the slightest touch. The good news: gingivitis is fully reversible with professional scaling and improved home care. In most cases, a single cleaning appointment combined with better brushing technique eliminates bleeding within 2–3 weeks.

2. Brushing too hard

Aggressive brushing with a hard-bristled brush damages both gum tissue and enamel. The correct technique uses a soft-bristled brush at a 45-degree angle to the gumline, with small circular or gentle back-and-forth strokes — no more pressure than you would use to write with a pen. If you habitually press hard, consider an electric toothbrush with a pressure sensor.

3. Starting to floss after a gap

If you have not flossed regularly and start doing so, expect bleeding for the first 5–7 days. This is the inflamed gum tissue responding to disruption. If bleeding persists beyond 2 weeks of daily flossing, see a dentist — it means the inflammation has a deeper cause.

4. Gum disease (periodontitis)

Advanced gum disease involves infection in the pockets between teeth and gums. Bleeding that persists despite good hygiene, gums that have pulled away from teeth, or loose teeth may indicate periodontitis — which requires professional treatment, not just better brushing.

5. Blood thinning medications

Aspirin, warfarin, clopidogrel, and other anticoagulants reduce clotting and can cause more noticeable gum bleeding. This does not mean you stop your medication — but tell your dentist what you are taking. They can adjust their technique and advise appropriately.

6. Vitamin C or K deficiency

Vitamin C is essential for collagen production, which maintains gum integrity. Deficiency leads to weakened gum tissue that bleeds easily. Vitamin K deficiency impairs clotting. These are less common causes in patients with varied diets but worth considering if other causes have been ruled out.

7. Pregnancy (pregnancy gingivitis)

Hormonal changes during pregnancy increase gum sensitivity to plaque and cause exaggerated inflammatory responses. Pregnancy gingivitis typically begins in the first trimester and improves after delivery. Maintaining excellent oral hygiene and attending routine dental cleanings during pregnancy is safe and important.

8. Ill-fitting dental appliances

Dentures, retainers, or other appliances that do not fit properly can chronically irritate gum tissue at specific points, causing localised bleeding. A dental adjustment usually resolves this quickly.

When should bleeding gums worry you?

See a dentist if gum bleeding is persistent (more than 2 weeks), occurs spontaneously (without touching), is accompanied by swelling, recession, bad breath, or loose teeth, or if you are not sure of the cause. Early gum disease is easy to treat — advanced periodontitis is not.

Have a question about your dental health? Our team is happy to help — no appointment needed to ask.

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