What the pattern usually looks like
Women who notice it describe something fairly consistent. In roughly the three to five days before bleeding begins, the gum margins look puffier and darker, feel tender when brushing, and blood appears on the brush or floss where it normally would not. Some notice a metallic taste, some a mild ache in the jaw, some get mouth ulcers at the same point in every cycle. Within a day or two of the period starting, it fades.
The mechanism is the one that operates in pregnancy, at much lower volume. Oestrogen and progesterone make the small blood vessels in the gum more permeable and modulate how the local immune system responds to plaque at the gum margin. In the luteal phase — between ovulation and menstruation, when progesterone is highest — the same deposit therefore provokes a stronger visible reaction. Some women report a milder version around ovulation.
Two things are worth being straight about. This is a well-described clinical observation rather than a heavily quantified one, so nobody can tell you what percentage of women it affects or by how much. And the size of the effect varies enormously between individuals, which is why one woman finds this describes her exactly and another has never noticed a thing.
The rule that makes sense of all of it
If you take one sentence away: hormonal change amplifies inflammation, it does not cause it.
That rule explains why two women with the same cycle have completely different experiences. Where the gum margin is clean there is very little to amplify, and the cycle passes almost unnoticed. Where a film of plaque has sat undisturbed between two back teeth for months, the premenstrual days lift that low-grade, invisible inflammation over the threshold where you can see it.
Which gives you a more useful sentence. Instead of “my hormones make my gums bleed”, try “my hormones are showing me which spots I miss.” The places that flare first are not random: the interdental spaces, the crowded lower front teeth, the area behind the last molar — the places a brush does not reach and floss never quite gets to.
That is good news, because it means the flare responds to something you control. Women who add proper daily cleaning between the teeth often find the monthly pattern quietens over two or three cycles — not because their hormones changed, but because there is less left to amplify.
Track two cycles — it takes a minute a day
Vague impressions make for vague appointments. Two cycles of rough notes give us something to work with.
| Note down | Why it matters |
|---|---|
| Which days bleeding occurs, relative to day 1 of your period | Confirms whether it is genuinely cyclical or continuous |
| Where in the mouth — front, back, one side, everywhere | A single spot behaves differently from a general pattern |
| Whether it happens with brushing, with flossing, or on its own | Bleeding without any contact is a different signal |
| Mouth ulcers, and where they appear | Cyclical ulcers have a recognisable rhythm |
| Any new medication, including hormonal contraception | Changes the baseline you are comparing against |
Bring that to your appointment. It is more informative than most examinations manage on their own, because we see one day and you see the whole month.
The same mechanism, at different volumes
The premenstrual flare is one point on a much longer line, and recognising it makes the other points less surprising when they arrive.
Puberty. The first hormonal surge often produces markedly swollen, easily bleeding gums in adolescents, at precisely the age when cleaning between the teeth is least popular.
Hormonal contraception. Modern preparations contain far lower hormone doses than the ones the older warnings were written about, and the gum effects described today are correspondingly smaller — the topic is taken up properly in The contraceptive pill and your gums: what hormonal contraception does to oral health (EN).
Pregnancy. The same reaction at its strongest, familiar to most women who have been through it.
The menopause. The direction reverses. Instead of amplified inflammation, the dominant problems become dryness and thinner, more fragile tissue — see Menopause and your gums: what changes in your mouth, and what actually helps (EN).
One thread runs through all four phases: the hormones set the sensitivity, the plaque sets the ceiling. You can only influence one of the two, and fortunately it is the decisive one.
When it is not your cycle
Cyclical bleeding is reassuring precisely because it is cyclical. The following patterns are not, and each points somewhere different.
- Bleeding every day, all month. Not hormonal timing but established gum inflammation, and it needs measuring rather than tracking: Periodontitis treatment – service page (EN).
- One spot that bleeds while the rest of your mouth is fine. Often something local — an overhanging filling edge, food impacted below the gum, a failed crown margin. Local causes have local solutions and are usually quick to fix.
- Gums that bleed without being touched, or bleeding that is hard to stop.
- Bleeding elsewhere too — nosebleeds, bruises without cause, cuts that ooze longer than they should. That combination belongs with your GP (Hausarzt), because it points at the blood rather than the mouth.
- A new medication. Blood thinners (Blutverdünner) are the obvious one; a few other medicines cause gum overgrowth as a known side effect. Tell us what you take, and never adjust a prescription yourself.
- Heavy periods plus a sore tongue and persistent tiredness. Worth mentioning to your GP, since iron status is a simple blood test and low iron can show in the mouth. A suggestion to have it checked — not a diagnosis, and not something a dental examination establishes.
OestrogenProgesterone
What helps in the sensitive days
Nothing here is dramatic, and none of it is a product you need to be sold.
Do not ease off in the tender days. The instinct to skip a sore area feeds exactly the process that made it sore. Clean it gently and properly instead.
Get your interdental size checked. The commonest reason interdental cleaning fails is a brush too small for the gap, sliding through without touching the walls. A two-minute fix at an appointment, and it changes results more than switching toothpaste ever will.
Use a soft brush and let it do the work. Pressure does not compensate for technique, and inflamed tissue tolerates it badly.
Book professional cleaning outside the sensitive window if you know your pattern — nothing prevents it during those days, it is simply more comfortable in the first half of the cycle. Professional cleaning (professionelle Zahnreinigung, PZR) is usually a private service in Germany, though some funds contribute.
Do not reach for salt water and hope. Rinsing soothes and does not remove a biofilm. A comfort measure, not a treatment.
What is normal — and when to have it looked at
Talking about it in a German practice — and in English
Cyclical symptoms tend to go unmentioned, partly because they feel too minor to bring up and partly because they have usually settled by the time you are sitting in the chair. Mention them anyway. The German terms you will hear are Zahnfleischbluten for bleeding gums and Zyklus for the cycle, and “das Zahnfleisch blutet vor der Periode” is a perfectly ordinary thing to say to a dental practice.
If your German is limited, describing a pattern over time is exactly the kind of thing that gets lost in translation — which is the sort of detail that makes an English-speaking practice worth the trip: English-Speaking Dentist in NRW.
Not in itself. What is worth treating is whatever the hormones are amplifying, and that is nearly always plaque between the teeth. Clean those spaces daily for two or three cycles: if the pattern fades, you have your answer. If it does not, have the gums measured.
The current understanding is that it amplifies an existing inflammatory response rather than driving destruction by itself. Periodontitis develops out of persistent bacterial inflammation. Cyclical sensitivity is best treated as an early warning system, not a cause.
Only for comfort, and only if you have a clear pattern. Nothing about treatment is unsafe in the days before a period; it is simply easier in the first half of the cycle.
A cyclical rhythm to aphthous ulcers is recognised, and they are benign, usually healing within one to two weeks. Anything severe and recurring, or still there after two weeks, should be examined — and if ulcers come with tiredness or heavy periods, iron and vitamin levels are worth checking with your GP.
No, and that is the important distinction here. Continuous bleeding is not cycle-related: inflammation is present all the time, and the next step is measuring the pockets around your teeth to establish whether the attachment to the bone is intact.
A little swelling and bleeding in the days before your period is common, has a plausible hormonal explanation, and settles once the period starts. It is best understood as a monthly report on your cleaning rather than as a problem in its own right — the spots that flare first are the spots that need attention. Clean between the teeth daily, particularly where it is tender, and see whether the pattern quietens over two or three cycles. Bleeding that ignores your cycle entirely, or comes with loose teeth or receding margins, is a different conversation and belongs in a dental chair.
Zahnarztpraxis Tsypin · Wuppertal. This article was medically reviewed and is provided for information; it does not replace an examination. Updated August 2026.
