Is dental treatment safe during pregnancy?

The verdict

Yes, and postponing it is the mistake. ACOG's committee opinion on oral health care states that oral health is an important component of general health and should be maintained during pregnancy, that studies have not raised concern about the safety of dental services during pregnancy, and that women should be counselled about the safety and importance of oral health care while pregnant.

Check-ups, scale and polish, fillings, extractions, root canal treatment and dental X-rays are all in scope. There is no trimester in which routine dentistry is off limits, and no national body advises deferring treatment for a problem until after the birth.

There is exactly one material restriction, and it is not the one people ask about. It concerns mercury amalgam, and in the United Kingdom and Ireland it is written into law rather than into guidance.

Why pregnancy makes dental care more important, not less

Pregnancy changes the mouth. Raised progesterone and oestrogen alter the gum response to plaque, so gums that were fine before become swollen, tender and prone to bleeding when you brush. ACOG notes that pregnancy gingivitis typically peaks in the third trimester.

Two further pregnancy features work against your teeth. Sickness in the first trimester bathes them in stomach acid, and the instinct to brush immediately afterwards drives that acid into softened enamel. Rinse with water first and wait before brushing. And the grazing pattern that helps nausea, small carbohydrate snacks through the day, keeps the mouth acidic for far longer than three meals would.

None of that is a reason to stay away from the dentist. It is the reason to go.

The X-ray question

A dental X-ray is one of the lowest-dose imaging examinations in routine medicine, the beam is directed at the jaw rather than the abdomen, and lead shielding is standard practice. The NHS advises telling the healthcare professional if you are pregnant or might be pregnant before any X-ray, which is the correct instruction: the decision is the clinician's to make with that information, not yours to make by cancelling the appointment.

In practice a dentist will often defer a purely routine radiograph until after the birth, simply because there is no urgency. That is a scheduling judgement rather than a safety verdict, and it should not be read as an admission that the X-ray would have been dangerous. If a radiograph is needed to diagnose pain or infection, it is taken.

The amalgam exception

This is where the answer stops being "everything is fine" and becomes specific.

Dental amalgam is roughly half mercury by weight. The FDA states that amalgam fillings may release small amounts of mercury as a vapour, and that when a new filling is placed or an old one removed, patients may experience a temporary increase in exposure. In September 2020 it issued recommendations naming women who are pregnant or planning to become pregnant, nursing mothers, children under six and several other groups as potentially more susceptible, and advising that if you are in one of those groups and need a new filling you avoid dental amalgam if possible and appropriate.

The United Kingdom and the European Union went further and made it law. Article 10(2) of Regulation (EU) 2017/852, retained in UK law, states that from 1 July 2018 dental amalgam shall not be used for dental treatment of deciduous teeth, of children under 15 years and of pregnant or breastfeeding women, except when deemed strictly necessary by the dental practitioner based on the specific medical needs of the patient.

Note what that does and does not mean. It is a restriction on placing new amalgam, with a clinical override. It says nothing about fillings you already have.

Do not have old fillings taken out

The FDA is explicit and it is the most important sentence on this page for anyone with existing silver fillings: intact amalgam fillings in anyone, including those at greater risk such as pregnant or nursing mothers and children, should not be removed for the purpose of preventing any disease or health condition, unless considered medically necessary by a health care professional.

The reasoning is straightforward. Drilling out a sound filling destroys healthy tooth structure and produces exactly the transient spike in mercury vapour you were trying to avoid. Removal makes your exposure worse, not better.

What it costs

In England, NHS dental treatment is free if you are pregnant when you start treatment, or if you have had a baby in the 12 months before treatment starts. You need a maternity exemption certificate, which your midwife, GP or health visitor can arrange. The entitlement runs for the full 12 months after the birth, so a course of treatment you keep putting off through pregnancy is still free well into your baby's first year.

That is not a trivial detail. Cost is one of the main reasons dental problems are left in pregnancy, and in this window it has been removed.

Where guidance genuinely differs

The UK and Ireland restrict amalgam by statute; the US restricts it by advice. Article 10(2) of Regulation (EU) 2017/852 is a legal prohibition with a clinical exception, and it applies in Ireland and, as retained law, in the UK. The FDA's 2020 position is a recommendation to avoid amalgam "if possible and appropriate" for high-risk groups including pregnant women. The practical outcome is similar; the legal force is not.

The US has a formal clinical statement on the safety of dental care in pregnancy; the UK does not. ACOG's committee opinion sets out that dental services during pregnancy are safe and that clinicians should counsel women accordingly. UK national guidance approaches the same question through the funding route instead, by making treatment free, and does not publish an equivalent clinical safety statement for patients.

Nobody publishes a dental X-ray dose limit for pregnancy. Neither ACOG nor the NHS sets a number of radiographs, a trimester restriction or a millisievert ceiling for dental imaging. The consistent instruction across both is procedural rather than numerical: tell them you are pregnant, and let the clinician decide whether the image is needed now.