Blood in the sink after brushing is alarming in a way that its clinical significance does not justify. Pregnancy gingivitis is common, it is reversible, and the treatment is the thing most people stop doing the moment they see blood.
The short answer: progesterone makes gum tissue react far more strongly to ordinary plaque, and a 50% rise in blood volume engorges the small vessels in the gums. Together that is pregnancy gingivitis — swollen gums that bleed when brushed. It is normal, and it reverses with gentle but thorough brushing twice a day plus daily cleaning between the teeth. Brushing less makes it worse. See a dentist for swelling, pain, a loose tooth, or bleeding that happens without brushing.
Why it happens
Gingivitis is a response to plaque, and plaque is present in every mouth. What pregnancy changes is the size of the response. Raised progesterone increases blood flow to the gums and alters how the local immune system reacts to the bacteria already living there, so a level of plaque that produced nothing before now produces visible swelling. The tissue becomes softer and more vascular, and soft vascular tissue bleeds when you touch it.
The effect builds through the pregnancy and is usually most obvious in the second and third trimesters. It resolves after birth as hormones return to baseline — provided the plaque has been kept under control in the meantime, because gingivitis left alone long enough is what becomes periodontitis, and periodontitis does not reverse.
What is normal
| Pregnancy gingivitis | See a dentist | |
|---|---|---|
| Bleeding | Only when brushing or flossing | Spontaneous, or heavy and hard to stop |
| Gums | Slightly red and puffy at the gumline | Painful, receding, or pulling away from the teeth |
| Teeth | Firm | Any looseness or change in how they meet |
| Other | Nothing | Persistent bad taste or smell, or a discharge of pus |
| Response | Improves within a week or two of good cleaning | No change, or worsening, despite it |
What actually helps
🦷 The things that change it
- Brush twice a day with a soft brush, for two minutes. Gently, along the gumline, not scrubbing. Expect some bleeding at first — it settles as the inflammation does.
- Clean between the teeth daily. Floss or interdental brushes. This is where the plaque that causes the bleeding actually sits.
- See a dentist during the pregnancy. A professional clean removes what brushing cannot. In the UK this is free while pregnant and for 12 months after birth.
- If you are being sick, do not brush immediately. Stomach acid softens enamel and brushing straight afterwards scrubs it away. Rinse with water, or with a teaspoon of bicarbonate of soda in water, and wait an hour.
- Use fluoride toothpaste and spit rather than rinse, so the fluoride stays on the teeth.
When to call
See a dentist — not urgently, but do not put it off — for painful or heavily swollen gums, a loose tooth, gums pulling away from the teeth, a persistent bad taste, or a lump on the gum that keeps bleeding.
Mention it to your midwife if gums bleed without being touched, or if you are also getting frequent nosebleeds or bruising easily. Bleeding from more than one place is a different question from bleeding gums, and it is answered with a blood test rather than a toothbrush.
Bleeding gums in pregnancy — at a glance
Progesterone amplifies the gum tissue's inflammatory response to ordinary plaque and increased blood volume engorges the small vessels, producing pregnancy gingivitis: swollen tender gums that bleed on brushing, usually most obvious in the second and third trimesters. It is normal and it reverses. The treatment is the thing the sight of blood discourages — gentle, thorough brushing twice a day with a soft brush plus daily cleaning between the teeth — and bleeding typically settles within a week or two of doing it consistently. Routine dental care is appropriate throughout pregnancy and is free on the NHS while pregnant and for a year afterwards. A soft red lump between two teeth is usually a pregnancy epulis, benign and self-resolving after birth. What needs a dentist promptly is pain, heavy swelling, receding gums, a loose tooth or a persistent bad taste; what needs a midwife instead is bleeding that happens without brushing, or bleeding from the nose and gums together.
Inside Baby Novum: appointments and reminders sit alongside the antenatal schedule, so a dental check keeps a place in the calendar rather than sliding behind the scans. It is all stored encrypted on the device, with no account and no server holding a copy.
Frequently Asked Questions
Why do my gums bleed in pregnancy?
Two changes at once. Progesterone increases the gum tissue's inflammatory response to ordinary plaque, so the same amount of plaque produces much more swelling than it did before. At the same time blood volume rises by around half, and the small vessels in the gums are more engorged. The result — pregnancy gingivitis — is swollen, tender gums that bleed easily when brushed or flossed.
Should I brush less if my gums bleed?
No, and this is the single most useful thing on this page. Gums bleed because of plaque at the gumline; brushing less leaves more plaque, which produces more inflammation and more bleeding. The answer is to brush gently but thoroughly, twice a day, with a soft brush, and to clean between the teeth daily. Bleeding usually reduces within a week or two of doing that consistently.
Can I go to the dentist while pregnant?
Yes, and you should. Routine dental care — examinations, cleaning, fillings — is appropriate during pregnancy. Tell the practice you are pregnant and how many weeks, because it affects positioning and some choices. Dental X-rays are generally avoided unless needed, and shielding is used when they are. In the UK, NHS dental treatment is free during pregnancy and for a year after birth.
What is a pregnancy epulis?
A soft red lump on the gum, usually between two teeth, that appears in pregnancy and can bleed readily. It is a benign overgrowth of gum tissue driven by the same hormonal response, and it typically shrinks after birth without treatment. It is worth showing a dentist to confirm what it is, and it is only removed if it is painful, interferes with eating or bleeds heavily.
When are bleeding gums a sign of something else?
Gums that bleed heavily or spontaneously — without brushing — or bleeding elsewhere at the same time, such as frequent nosebleeds or easy bruising, is a different picture and worth mentioning to your midwife rather than your dentist. Persistent swelling, pain, a bad taste, or a tooth that has become loose needs a dentist promptly, since that is periodontitis rather than gingivitis.