A little pink in the sink is so common that most people stop noticing it. That is unfortunate, because it is your gums sending the only warning signal they have. Why do my gums bleed when I brush is a question with a fairly consistent answer, and the good news is that at this stage the problem is almost always completely reversible.
There is one instinctive response that makes it worse, and I will come to that shortly.
On this page
- The usual reason
- The mistake nearly everyone makes
- What to do instead
- How long until it stops?
- Other reasons gums bleed
- When bleeding is absent but disease is present
- When to see your dentist
- What to take away
The usual reason
Healthy gums do not bleed. They are firm, pale pink, and sit snugly around the teeth without complaint, even when brushed thoroughly.
Bleeding means inflammation, and inflammation is almost always caused by plaque gathering along the gum line. Plaque is a soft bacterial film that forms constantly, and where it sits undisturbed against the gum, the gum becomes inflamed, swollen and fragile. Fragile tissue bleeds when touched.
That is the early stage of gum disease, called gingivitis, and it is completely reversible. Remove the plaque consistently and the gums heal fully, usually within a couple of weeks.
The mistake nearly everyone makes
The instinct when something bleeds is to leave it alone. So people brush the area more gently, or skip it altogether, and stop cleaning between the teeth on that side.
That is precisely backwards. Avoiding the area lets more plaque accumulate, which increases the inflammation, which causes more bleeding, which encourages more avoidance. It is a loop, and it is how gingivitis quietly becomes something worse.
Bleeding gums need cleaning more, not less.
What to do instead
- Keep brushing, thoroughly but not aggressively, twice a day for two full minutes.
- Angle the bristles towards the gum line at about 45 degrees, so they reach slightly under the gum edge where the plaque actually sits. Our post on how to brush your teeth properly covers the technique.
- Clean between your teeth every day. This is the step that matters most and the one most people skip. Interdental brushes or floss reach where a toothbrush cannot.
- Use the right size interdental brushes. Too small and they pass through without touching anything. Ask to be shown which sizes fit your gaps.
- Do not scrub harder. Aggressive brushing damages gums without cleaning better.
- Book a hygiene appointment. Hardened tartar cannot be removed at home, and it will keep the inflammation going however well you brush.
How long until it stops?
For most people, bleeding reduces noticeably within a week and stops within two to three weeks of consistent cleaning.
If it has not settled after a fortnight of genuinely good cleaning, that is worth investigating rather than persevering with, because it usually means either tartar that needs professionally removing, or gum disease that has progressed beyond the early stage.
Other reasons gums bleed
Plaque is the usual cause, but not the only one:
- Starting a new cleaning routine. If you have just begun cleaning between your teeth, some bleeding for a week or two is normal and settles.
- Pregnancy. Hormonal changes make gums more reactive to plaque, and pregnancy gingivitis is common. It still needs treating rather than waiting out.
- Certain medications, including blood thinners, which increase bleeding tendency generally.
- Brushing too hard, or a hard-bristled brush, which causes trauma rather than inflammation.
- Ill-fitting dentures or dental work irritating the gum in one specific spot.
- General health conditions, including diabetes, which affects gum health considerably.
Bleeding confined to one specific spot is worth mentioning, since it often has a local cause such as a rough filling edge or something trapped.
When bleeding is absent but disease is present
Worth knowing, because it catches people out: smokers' gums often do not bleed even when significantly inflamed, because smoking restricts blood flow to the gums.
That means the early warning system is switched off, and gum disease in smokers is frequently more advanced by the time anything is noticed. Our post on what smoking does to teeth and gums explains this in more detail, and it is the strongest reason for smokers to have their gums measured regularly rather than judged by appearance.
When to see your dentist
Book an appointment if:
- Bleeding has not settled after two weeks of good cleaning
- Your gums are receding, or your teeth look longer
- You have persistent bad breath or a bad taste
- Gums are swollen, painful or you notice pus
- Any tooth feels loose or your bite feels different
- Bleeding is confined to one specific area
At the appointment your gums are measured rather than simply looked at, which gives a precise picture of where you stand. Our post on whether gum disease is reversible explains why that distinction between the early and later stages matters so much, and our page on gum disease treatment covers what treatment involves.
Most cases are resolved with a professional clean and better home cleaning. The NHS page on gum disease has further general guidance.
What to take away
Bleeding gums almost always mean plaque-related inflammation, which is completely reversible at this stage. The worst response is to brush more gently or avoid the area. Keep brushing, add daily cleaning between your teeth, and book a hygiene appointment if it has not settled within a fortnight.
If your gums have been bleeding for a while, ring us on 01255 422506 and let us see exactly where things stand. Our post on whether you should clean your tongue covers another commonly missed part of the routine.
This article is general information rather than personal dental advice. Every mouth is different, so please speak to your dentist about your own teeth.