If your gums start bleeding more than usual partway through an IVF cycle, you are not imagining it. Hormone levels during ovarian stimulation rise well above those of a natural cycle, and gum tissue reacts to those hormones by becoming more inflamed around the plaque that is already there. It is a known, manageable effect, and it is not a sign that anything is wrong with the cycle.
Gums that were already a little inflamed before treatment tend to react most. That makes the weeks before stimulation a good time to get them in order.
One study measured the change before and after IVF
The clearest data come from a Greek study by Pavlatou and colleagues, published in the Journal of the International Academy of Periodontology in 2013. They examined the gums of 60 women aged 29 to 41 before and after IVF treatment. Across the whole group, the gingival index, a score of visible gum inflammation, rose from about 32% to about 62%. In women who had gingivitis going in, it rose further, from about 37% to about 78%. Women with periodontitis, the more advanced form of gum disease, had more bleeding sites after treatment than before, rising from about 68% to about 90%.
It was a small study, and it measured gums before and after rather than following women for months. It does, though, match what is well known about pregnancy: when oestrogen and progesterone are high, gums bleed and swell more easily in response to plaque.
Why the hormones make gums react
Gum tissue responds to sex hormones. When oestrogen and progesterone rise, blood flow to the gums increases and the tissue reacts more strongly to bacteria at the gum line. The plaque has not changed, but the body's response to it has. That is why some women notice bleeding or puffiness even though their brushing routine is the same as always.
How quickly this settles after a cycle has not been studied well. It is reasonable to expect the effect to ease as hormone levels come down, as pregnancy gingivitis usually improves after birth, but gums with ongoing gingivitis will stay inflamed until the plaque problem is dealt with.
| During an IVF cycle | During pregnancy | |
|---|---|---|
| Cause of the hormone rise | Stimulation medicines, for a short period | Natural pregnancy hormones, over months |
| What tends to happen | More inflammation, especially if gingivitis was already present | Pregnancy gingivitis: swollen gums that bleed easily |
| What helps | A clean before the cycle and gentle, regular cleaning throughout | Regular cleans and steady home care through pregnancy |
Our guide to pregnancy gingivitis covers the pregnancy side in more depth.
Gums and IVF success: the evidence is mixed
Pavlatou's group also reported a trend linking poorer gum health with fewer follicles and embryos, and concluded that poor gum health before IVF seemed to be associated with poorer outcomes. A 2019 pilot study by Khalife and colleagues in the International Journal of Women's Health, on the other hand, found no association between gum disease and poor IVF outcomes. Both studies were small.
The fair summary is that a link has been suggested but not shown, and there is no evidence that gum treatment improves the chance of IVF working. Gum disease is worth treating because it damages gums and teeth and can lead to tooth loss, not as a fertility treatment. Our overview of gum disease and pregnancy outcomes looks at what the research shows once you are pregnant.
A clean before stimulation starts
The most useful step is a check-up and professional clean a few weeks before stimulation begins. Removing tartar and treating any gingivitis means there is less inflammation for the hormones to build on. Booking early, rather than in the last few days before a cycle, gives the gums time to settle and leaves room for any other treatment you need. Our oral health therapists, Sabrina Tran and Jennifer Nguyen, focus on prevention and gum health and can see you for this.
Looking after tender gums during a cycle
When gums bleed, many people brush more lightly or stop flossing. That usually makes things worse, because more plaque is left on gums that are already reactive. A few changes help:
- Use a soft toothbrush, angled gently toward the gum line.
- Keep cleaning between your teeth every day with floss or interdental brushes, even if they bleed at first.
- An alcohol-free mouth rinse can be added if your dentist or OHT suggests it, but it does not replace brushing and cleaning between the teeth.
- Keep up your usual routine through egg collection and transfer; there is no need to change it on procedure days.
When bleeding needs a visit
Healthdirect advises seeing a dentist or OHT if your gums still bleed after 3 to 4 days of good brushing and flossing. Book sooner if your gums are very swollen or painful, if you notice a bad taste or pus, or if a tooth feels loose. Mild bleeding on its own is not an emergency and does not reflect on how the cycle is going.
Questions about X-rays, local anaesthetic, pain relief and timing other treatment are covered in our guide to IVF and dental treatment, what to do and when.
Questions we are often asked
Is more bleeding during IVF normal?
Some increase in gum inflammation is a recognised effect of the high hormone levels during stimulation. Gentle, thorough cleaning usually keeps it under control.
Can I have a scale and clean during a cycle?
Yes. Routine cleaning and gum care can continue during a cycle. Let the practice know where you are in treatment so appointments can be fitted around scans and procedures.
Will treating my gums help IVF work?
That has not been shown. Treat your gums for the health of your mouth, and talk to your fertility specialist about anything affecting your chances.
If a cycle is coming up and you would like your gums checked and cleaned beforehand, Lumi Dental can time a visit around your plans. See our current deals or read about general dentistry at Melrose Park.
This article is general information only and is not a substitute for advice from your dentist or fertility specialist about your individual circumstances.
