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Two things change during pregnancy that affect the mouth directly: hormones alter how gums respond to plaque, and — for many people — stomach acid reaches the teeth far more often than usual.
Neither is dangerous if it is handled. Both are much easier handled early.
Free NHS dental care
In England, Wales and Northern Ireland you are entitled to free NHS dental treatment if you are pregnant, or have had a baby, at the point a course of treatment starts — so a course begun inside the twelve months stays free even if it finishes outside them. You need a maternity exemption certificate (MatEx), which your midwife or GP arranges; a MatB1 or your baby's birth certificate is also accepted as proof. In Scotland treatment is free while you are pregnant and while you are nursing, up to the baby's first birthday — and free anyway if you are under 26.
This covers check-ups and any NHS treatment needed in that period. It is a genuinely valuable entitlement and is regularly missed — the twelve months after birth being, understandably, when dental appointments fall down the list.
Pregnancy gingivitis
Raised progesterone makes gum tissue respond far more strongly to the same amount of plaque. Gums become redder, puffier, and bleed more easily — typically from the second month, peaking around the eighth.
The plaque has not changed. The response to it has.
What helps is unglamorous and effective: brush twice a day for two minutes with fluoride toothpaste, clean between the teeth daily, and keep going even though they bleed. Bleeding gums are a reason to clean them more gently and more consistently, not to leave them alone.
A hygiene appointment during pregnancy is worth having, and is free.
Occasionally a localised lump appears on the gum — a "pregnancy epulis". It is benign and usually resolves after the birth. It should still be looked at.
Morning sickness
Stomach acid is far stronger than anything in your diet, and repeated vomiting erodes enamel, especially on the inside surfaces of the upper front teeth where you cannot see it happening.
After being sick:
- Do not brush straight afterwards. Leave it a while — half an hour to an hour is the usual advice, though the evidence on exactly how long is thin. Rinsing matters more than the timing
- Rinse with plain water straight away — or a fluoride mouthwash, which is the other option in the guidance
- Smear fluoride toothpaste on with a finger if you cannot face a toothbrush. It is in the national guidance for exactly this, it leaves the fluoride where it is needed, and it improves the taste
- Use a fluoride toothpaste, and do not rinse after brushing
- If the toothpaste flavour triggers nausea, try a different flavour or a children’s paste — but keep the fluoride
Treatment during pregnancy
Routine dental treatment, including fillings and local anaesthetic, is safe. The second trimester is generally the most comfortable time for anything elective, simply because lying back is easier then.
- Tell your dentist you are pregnant, and how far along
- You are usually offered the option of waiting for routine X-rays; any that are genuinely needed can be taken, and being pregnant is not a reason one cannot be. A lead apron is not used — UK guidance stopped recommending them routinely for dental X-rays because the beam is never pointed at your abdomen, which makes the dose reaching the baby negligible
- Amalgam is not normally placed during pregnancy or breastfeeding in the UK — the law makes an exception where a dentist judges it strictly necessary for your particular situation, so if you are offered it, that is the exception rather than a mistake
- Lying flat can become uncomfortable later on — ask to be tilted slightly onto your left side
Do not leave a dental problem untreated for nine months out of caution. Untreated infection carries its own risks, and treating it is routine.
Afterwards
Snacking at odd hours, drinks by the bed and broken sleep all raise decay risk in the first year — for you, not just the baby. Water rather than sweet drinks overnight, and using the free twelve months, covers most of it.
