A lot of people notice blood on their toothbrush or in the sink when they spit after brushing, shrug it off, and carry on. Some assume it means they're brushing too hard. Some think it's normal. It's not.
Healthy gums do not bleed when you brush with a normal amount of pressure. If yours do, that's your body flagging an infection in the gum tissue. Most of the time it's gingivitis — early-stage gum inflammation that's completely reversible. Sometimes it's the start of periodontitis, which is a different problem and significantly harder to manage. Knowing which one it is matters.
What's Actually Causing the Bleeding
The most common cause is plaque buildup along and beneath the gum line. Plaque is a sticky film of bacteria that forms on teeth throughout the day. When it's not removed regularly by brushing and flossing, it hardens into calculus (tartar) — a mineralised deposit that can't be removed by brushing alone. The bacteria in plaque release toxins that irritate gum tissue, causing it to become inflamed, swollen, and prone to bleeding.
This is gingivitis. At this stage, the underlying bone and connective tissue that hold the tooth in place are not yet damaged. Gingivitis is fully reversible with a professional clean and improved home care. Many people have it for years without realising it.
If gingivitis is left untreated, it can progress to periodontitis — where the infection spreads below the gum line, the gum pulls away from the tooth forming “pockets,” and the bone supporting the tooth starts to resorb. Once bone is lost, it doesn't grow back. Teeth become mobile, and without intervention, they eventually fall out or require extraction. Periodontitis is the leading cause of tooth loss in adults worldwide.
Other Things That Can Cause Bleeding Gums
Hormonal changes during pregnancy can cause “pregnancy gingivitis” — gums become more sensitive and reactive to plaque during the second trimester. It resolves after delivery, but gum health during pregnancy matters for the baby's health too. There's reasonable evidence linking periodontal disease to preterm birth and low birth weight.
Blood thinners like aspirin and warfarin increase bleeding tendency. If you've recently started a new medication and noticed your gums bleeding more, mention it to both your doctor and your dentist.
Vitamin C deficiency, though less common, causes gum tissue to become fragile and bleed easily. And occasionally, bleeding gums are a sign of a systemic condition like diabetes or a blood disorder — which is one more reason not to ignore a symptom that persists.
What Doesn't Work
Brushing harder is a common instinct. It doesn't help — it makes things worse. Aggressive brushing damages gum tissue and erodes enamel near the gum line without removing the calculus that's causing the problem. Use a soft-bristled brush, gentle circular pressure, and aim it at a 45-degree angle toward the gum line where plaque accumulates.
Mouthwash alone also won't fix it. Antiseptic mouthwash reduces bacterial load temporarily but can't remove calculus, and it can't reach bacteria that have penetrated below the gum line.
What Does Fix It
For gingivitis: a professional scale and polish to remove calculus, followed by proper brushing and flossing technique at home. Most patients see significant improvement in gum health within 2 to 4 weeks. The gums stop bleeding, the swelling reduces, and the tissue firms up.
For periodontitis: deep cleaning (root surface debridement) is needed to remove bacteria from below the gum line. In more advanced cases, a periodontist may need to be involved. The damage already done — bone loss — can't be reversed, but further progression can be stopped.
The most important thing is not to wait. Gum disease that catches a dentist's attention at the gingivitis stage is a straightforward, affordable fix. The same disease left for years becomes a much bigger problem.
If your gums bleed when you brush, a professional scale and polish is the right place to start. We'll assess your gum health properly and tell you what stage you're at.
Gums that bleed every time you brush? Book a check-up →