Bleeding gums when you brush or floss are most often a sign of gingivitis, an early and reversible form of gum inflammation caused by plaque sitting along the gumline. With thorough daily cleaning and a professional clean, mild bleeding often settles within a couple of weeks. If it does not, or if it comes with other symptoms, it is worth having your gums checked.
Why gums bleed: the most common cause
Plaque is a soft, sticky film of bacteria that forms on teeth every day. When it is left along the gumline, your body responds with inflammation: the gums become red, puffy and tender, and the tiny blood vessels near the surface bleed easily when they are touched by a toothbrush or floss.
This stage is called gingivitis. It is very common, and the encouraging news is that it is reversible. Once the plaque is consistently removed, the inflammation usually settles and the bleeding stops.
A common mistake is to brush or floss less in areas that bleed, which allows more plaque to build up and makes the problem worse. Gentle but thorough cleaning of those areas is usually what helps.
Gingivitis vs periodontitis
If gingivitis is left untreated for a long time, it can progress in some people to periodontitis. This is a deeper infection in which the gums and the bone supporting the teeth are gradually lost. Pockets form between the gums and teeth, gums may recede and, in later stages, teeth can become loose.
Periodontitis often causes little or no pain, so bleeding may be one of the few early warning signs. Unlike gingivitis, the bone loss from periodontitis cannot usually be reversed, but it can often be stabilised with professional treatment and good home care. Some people with more severe gum disease may be referred to a specialist periodontist.
Signs that it may be more than gingivitis
- Bleeding that continues despite two weeks of thorough brushing and cleaning between teeth
- Persistent bad breath or a bad taste
- Gums that are receding or teeth that look longer
- Pus around the teeth or gums
- Teeth that feel loose or are moving position
- Changes to the way your teeth meet when you bite
Other causes of bleeding gums
Plaque is the main cause, but other factors can make gums more likely to bleed or make inflammation worse.
Brushing technique and toothbrush choice
A hard-bristled brush or aggressive scrubbing can irritate the gums. A soft brush used with gentle, small circular movements angled towards the gumline cleans effectively without trauma. Starting to floss after a long break can also cause some bleeding for the first week or so, which usually settles as the gums get healthier.
Hormonal changes
Pregnancy, puberty and some hormonal medications can make gums more reactive to plaque. Pregnancy gingivitis is common, and it is a good reason to keep up dental visits during pregnancy; let your dentist know you are pregnant.
Medications and medical conditions
Blood-thinning medications can make gums bleed more readily. Some medications cause gum overgrowth or a dry mouth, both of which make plaque control harder. Diabetes is closely linked with gum disease, and poorly controlled blood sugar can make gum problems worse. Never stop a prescribed medication because of bleeding gums; talk to your dentist and doctor instead.
Smoking and vaping
Smoking increases the risk of gum disease significantly. It also reduces blood flow to the gums, which can mask bleeding, so smokers may have gum disease without noticing much bleeding at all.
Less common causes
Occasionally, bleeding gums are linked to vitamin deficiencies (such as vitamin C), blood disorders or other medical conditions. If you have unexplained bleeding elsewhere, easy bruising, or you feel generally unwell, see your GP as well as your dentist.
What you can do at home
For mild bleeding with no other symptoms, a two-week reset of your home care is a reasonable first step:
- Brush twice a day for two minutes with a soft-bristled manual or electric toothbrush and a fluoride toothpaste, angling the bristles towards the gumline.
- Clean between your teeth once a day with floss or interdental brushes. Interdental brushes are often easier and more effective where there are gaps between teeth.
- Do not avoid the bleeding areas. Clean them gently and thoroughly.
- Cut back on frequent sugary snacks and drinks, which feed plaque bacteria.
- If you smoke or vape, consider getting support to quit. Your GP or pharmacist can help.
Mouthwash can be a useful extra but does not replace brushing and cleaning between teeth. Some antiseptic mouthwashes can stain teeth with long-term use, so ask your dentist before using one regularly.
Our preventive dentistry page has more about the everyday habits that help keep gums healthy.
How a dentist treats bleeding gums
Home care cannot remove tartar, the hardened plaque that builds up above and below the gumline. Once it forms, it keeps irritating the gums no matter how well you brush. Treatment usually starts with a thorough assessment.
Examination and gum measurements
Your dentist will check your gums, measure the pockets around your teeth and may take X-rays to look at the bone level. This tells them whether you have gingivitis or periodontitis and how severe it is.
Professional clean
For gingivitis, a professional scale and clean to remove plaque and tartar, together with improved home care, is usually all that is needed. You can learn more on our dental cleaning page.
Deeper cleaning for gum disease
For periodontitis, deeper cleaning below the gumline (sometimes called root planing or debridement) may be recommended, often over more than one visit and usually with local anaesthetic. Gums can feel tender and teeth can be more sensitive for a short time afterwards, and as the inflammation settles, gums may shrink back slightly. Regular maintenance visits are important afterwards, because gum disease can return if plaque control slips. Results vary depending on how severe the disease is, your home care and factors like smoking and diabetes.
When to see a dentist
Book a dental visit if your gums are still bleeding after two weeks of careful home care, or sooner if you notice any of the signs listed above, such as receding gums, persistent bad breath or loose teeth. Seek prompt care if you have swelling, pus, fever or significant pain, which can indicate an infection.
If you have not had a check-up in more than a year, bleeding gums are a good prompt to book one. Our Macquarie Park dentist team can assess your gums, explain what is happening and suggest a plan to suit your situation.
Frequently asked questions
Is it normal for gums to bleed when brushing?
It is common, but it is not normal for healthy gums. Bleeding is usually a sign of inflammation caused by plaque, and it often improves with thorough brushing, cleaning between teeth and a professional clean.
Should I stop flossing if my gums bleed?
No. Bleeding usually means the area needs more gentle cleaning, not less. If bleeding continues after about two weeks of daily flossing or interdental brushing, see your dentist.
Can bleeding gums go away on their own?
Mild gingivitis often settles with improved home care, but tartar cannot be removed by brushing. If bleeding persists, a professional clean is usually needed to get the gums back to health.
Are bleeding gums serious?
Often they are an early, reversible problem. However, they can also be a sign of periodontitis, which can lead to bone loss and loose teeth if untreated, so persistent bleeding should be checked.
Can pregnancy cause bleeding gums?
Yes. Hormonal changes during pregnancy can make gums more sensitive to plaque. Keep up your brushing and cleaning between teeth, and let your dentist know you are pregnant at your visit.
If your gums have been bleeding for a while, a check-up is a simple way to find out why. Call North Ryde Dentistry on (02) 8090 1102 or book an appointment.
This article is general information only and is not a substitute for advice from your own dentist. Any treatment carries risks; your dentist will discuss whether it is suitable for you.