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Dental Health and Breastfeeding

As with most professionals, my own included, dentistry seems to lack education on breastfeeding as part of undergraduate training if questions sent to this page exemplify a wider issue. I have tried to provide information for CPD inline with that written for other healthcare professionals.

I have developed this powerpoint presentation on the pharmacokinetics of drugs which dentists may use or prescribe for CPD information in an effort to break down the barriers of continuation of breastfeeding.

I am happy to answer individual questions or training. Please contact wendy@breastfeeding-and-medication.co.uk

In summary:

  • Breastfeeding mothers can have local anaesthetic injections with/without adrenaline and continue to breastfeed as normal
  • Breastfeeding mothers can take analgesics for dental pain and continue to breastfeed as normal
  • Breastfeeding mothers can have antibiotics and continue to breastfeed as normal
  • Breastfeeding mothers can use mouthwashes, gels and liquids for mouth ulcers ( e.g. Anbesol®, Bonjela®, Medijel®, Rinstead®, Iglu®, Orajel®) and fluoride toothpastes e.g. Durophat® and continue to breastfeed as normal
  • Breastfeeding mothers can have dental sedation for procedures and continue to breastfeed as normal.
  • White fillings: In some parts of the UK white fillings are recommended in pregnancy and lactation following an EU Directive (July 2018) but have to be paid for by the patient rather than being part of free NHS treatment. The information states that “These restrictions on the use of dental amalgam aim to help reduce environmental mercury pollution and are not a result of any safety concerns about amalgam fillings for dental patients.” 


  • Tooth Whitening: There appears to be no information available on the use of tooth whitening agents during lactation. Whilst it is unlikely that any significant transfer of the agents used into breastmilk will take place, if it can be delayed until breastfeeding has finished naturally, that would be preferable but there are many questions from mothers about to get married who dont want to wait. Unless the products spill from the bath in which the liquid is placed, resulting in burns to the mother’s mouth absorption into breastmilk is unlikely.

For information on mercury fillings please see the information from InfantRisk December 2023


Data suggests that maternal exposure to mercury vapor from dental amalgams or restoration is unlikely to have a significant impact on breastfeeding infants. 

The established baseline for mercury levels in human breastmilk is set at ≥ 1 mcg/L.15 A comprehensive study examining mercury content in breast milk from mothers with dental amalgams revealed a range of mercury concentrations in human milk samples, spanning from < 0.2 to 6.86 mcg/L, with an average of 0.37 mcg/L.16 Studies have demonstrated transfer of mercury from a mother’s bloodstream to her breastmilk. Intriguingly, mercury levels in commercial formula samples displayed a broader spectrum, varying from 0.4 to 2.5 mcg/L on average, which was actually higher than the findings in the collected breastmilk samples.16 

Remember, even if materials from mercury amalgams are orally ingested, elemental mercury is not absorbed from a healthy gastrointestinal tract. If a baby consumes miniscule mercury residues in breastmilk, it is likely that it wouldn’t be absorbed, especially as the baby ages and the GI tract matures. 


Breastfeeding with mercury fillings or after dental amalgam restoration is likely safe and the benefits of breastfeeding outweigh the risks. Extra-cautious mothers could choose not to breastfeed for the first three days post-amalgam restoration, but the difference in infant risk will be miniscule.

Powerpoint training for dental practitioners on the pharmacokinetics of drugs they may use in breastfeeding women

In a report Public Health England have made recommendations on dental health and breastfeeding. Full information can be accessed at : www.gov.uk/government/publications/breastfeeding-and-dental-health/breastfeeding-and-dental-health#breastfeeding-and-dental-health

  • dental teams should continue to support and encourage mothers to breastfeed
  • not being breastfed is associated with an increased risk of infectious morbidity (for example gastroenteritis, respiratory infections, middle-ear infections)
  • breastfeeding up to 12 months of age is associated with a decreased risk of tooth decay

Delivering Better Oral Health (PHE, 2014 updated content 2017)4 recommends that:

  • breast milk is the only food or drink babies need for around the first 6 months of their life, first formula milk is the only suitable alternative to breast milk
  • bottle-fed babies should be introduced to drinking from a free-flow cup from the age of 6 months and bottle feeding should be discouraged from 12 months old
  • only breast or formula milk or cooled, boiled water should be given in bottles
  • only milk or water should be drunk between meals and adding sugar to foods or drinks should be avoided

Recent systematic reviews such as that by Tham and others (2015)6 included studies where children were breastfed beyond 12 months. When infants are no longer exclusively breast or formula fed, confounding factors, such as the consumption of potentially cariogenic drinks and foods and tooth brushing practices (with fluoride toothpaste), need to be taken into account when investigating the impact of infant feeding practices on caries development. Tham and others (2015) noted that several of the studies did not consider these factors and concluded that with regard to associations between breastfeeding over 12 months and dental caries “further research with careful control of pertinent confounding factors is needed to elucidate this issue and better inform infant feeding guidelines”. Good quality evidence on breastfeeding and oral health is an area with significant methodological challenges which have been outlined by Peres and others (2018)7.

Of course I would also have to highlight that dental procedures, including sedation, local and general anaesthetic and use of antibiotics and analgesics need not interrupt breastfeeding

Powerpoint training for dental practitioners on passage of drugs in breastmilk

See also:

A Guide To Supporting Breastfeeding For The Medical Profession, Amy Brown and Wendy Jones

Prochlorperazine to treat symptoms of labarynthitis/vertigo and Breastfeeding

I am frequently asked about taking prochlorperazine (Buccastem® or Stemetil ®) to treat nausea due to labarynthitis, vertigo or dizziness. It is a drug I would be happy to prescribe and have used it myself as have my breastfeeding daughters. It seems a frequently asked question when the air pressure changes rapidly. Prochlorperazine may also be used for nausea

prochlorperazine and breastfeeding factsheet pdf

Brand names: Stemetil®, Buccastem®

Prochlorperazine is used to treat vertigo, labarynthitis or migraine particularly to treat nauseas caused by these conditions.

Its oral bio-availability is low due to high first-pass metabolism.  Long-term use should be avoided in breastfeeding where possible, particularly with very young babies where there is a potential risk of apnoea (breathing problems).

However short-term acute use for vertigo and labarynthitis probably poses few risks.  It is widely used for this purpose. It is licensed for use in children over 10 kg.

Compatible with use during breastfeeding if used short term. Avoid long term or where child is at risk of apnoea.

N.B This information is based on anecdote and experience as there are no research based studies on the amount passing into breastmilk.

see also https://breastfeeding-and-medication.co.uk/fact-sheet/betahistine-and-breastfeeding

Low dose aspirin and breastfeeding

It is not uncommon for breastfeeding mothers to need to take low dose aspirin, sometimes for reasons in pregnancy or after cardiac events. Whilst it isnt recommended regularly as a painkiller at a dose of 600mg four times a day it is compatible with breastfeeding in low dose of 75-150mg daily. There are no reported cases of Reye syndrome associated with the amount of low dose aspirin passing through breastmilk and it is widely used, particularly during pregnancy.

low dose aspirin and breastfeeding pdf

If accidentally taken at an analgesic dose see https://breastfeeding-and-medication.co.uk/fact-sheet/accidentally-taking-one-dose-of-aspirin-when-breastfeeding

Aspirin 75 -150mg acts by decreasing platelet adhesiveness irreversibly inhibiting aggregation. It is not used during treatment of thrombosis but may be used in cases of recurrent miscarriage or with risk of pre-eclampsia. In more serious conditions it is used post myocardial infarction (MI) and stroke or to decrease cardiovascular risk. There is little evidence that enteric-coated tablets are less likely to increase the risk of GI bleeds and may be less effective in their anti-platelet activity as well as more expensive. Although aspirin is not recommended during breastfeeding at analgesic doses of 600 mg four times a day, due to its association with Reye’s syndrome, use of the small dose in these circumstances may be considered to be acceptable. In the absence of the risk of association of Reye’s syndrome, aspirin would be a drug compatible with lactation due to its pharmacokinetic properties.

Before the link with Reye’s syndrome was identified, the children’s dose of aspirin was 75 mg four times a day. Relative infant dose is quoted as 2.5–10.8% (Hale 2017 online access). The BNF states that it should be avoided due to possible risk of Reye’s syndrome. Regular use of high doses could impair platelet function and produce hypo-prothrombinaemia in infant if neonatal vitamin K stores are low. After 2-4 hours there is virtually no aspirin in milk Compatible with breastfeeding if necessary at 75 -150mg mg daily, avoid as an analgesic Reye’s syndrome This is a rare syndrome, characterized by acute encephalopathy and fatty degeneration of the liver, usually after a viral illness or chickenpox. The incidence is falling but sporadic cases are still reported. It was often associated with the use of aspirin during the prodromal illness. Few cases occur in white children under 1 year although it is more common in black infants in this age group. Many children retrospectively examined show an underlying inborn error of metabolism.

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