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A baby’s first tooth is an exciting milestone, but it can also bring new questions for breastfeeding mothers. Will breastfeeding cause tooth decay? Should teeth be brushed straight away? What happens if the baby bites during feeding? These are common concerns, especially for new moms trying to balance feeding, sleep, teething, and everyday care.

World Breastfeeding Week (1–7 August) is a reminder that breastfeeding plays an important role in early health, comfort, and bonding. It also gives mothers a chance to learn how breastfeeding and oral care can work together once those tiny first teeth appear.

When Do Baby Teeth Usually Appear?

Most babies get their first tooth at around six months, although this can vary. Some babies cut teeth earlier, while others may only get their first tooth closer to their first birthday. The lower front teeth are often the first to appear, followed by the upper front teeth.

Teething can cause drooling, chewing, gum discomfort, mild irritability, and changes in feeding patterns. However, high fever, severe diarrhoea, vomiting, or a very unwell baby should not be blamed on teething and should be checked by a healthcare professional.

Does Breastfeeding Cause Tooth Decay?

Breastfeeding itself is not usually a cause of tooth decay. In fact, current evidence suggests that breastfeeding up to 12 months is linked with a lower risk of tooth decay. However, breastfed babies can still develop cavities, especially once teeth appear and oral hygiene is not maintained.

Tooth decay happens when bacteria in the mouth feed on sugars and produce acids that attack tooth enamel. Once a baby has teeth, frequent exposure to milk, formula, juice, sweetened drinks, or snacks can increase the risk of decay if teeth are not cleaned regularly.

The key message is simple: breastfeeding can continue, but baby teeth still need care.

Start Cleaning Before Teeth Appear

Good oral care can begin before the first tooth. For example, gently wiping the baby’s gums with a clean, soft, damp cloth helps remove bacteria and sugars while also helping babies get used to having their mouths cleaned.

Starting early can make tooth brushing feel more normal once teeth begin coming through.

Brush as Soon as the First Tooth Appears

Once the first tooth comes through, brushing should begin. Parents should use a baby toothbrush and a tiny smear of toothpaste.

At first, brushing may feel messy and difficult. That is completely normal. The goal is to slowly build the habit and brush gently twice a day, especially before bedtime.

Babies should also not be put to sleep with a bottle of milk, juice, or sweetened drinks, as this can increase the risk of early childhood tooth decay.

What About Night Feeds?

Many breastfed babies continue waking up at night, and night feeding can be part of normal development. Parents should not feel pressured to panic or make sudden changes to feeding. However, once teeth appear, it becomes more important to clean teeth before the longest sleep period and avoid sugary drinks or snacks during the night.

If a baby feeds often overnight and teeth are showing early signs of decay, a dentist can offer guidance based on the child’s needs without judgement.

Biting During Breastfeeding

Some babies bite while feeding, especially during teething. This can be painful and may make mothers anxious about continuing to breastfeed.

Biting often occurs when a baby is distracted, uncomfortable, or near the end of a feed. A baby who is actively breastfeeding with a deep latch usually cannot bite properly because the tongue covers the lower teeth.

If biting does take place, calmly break the latch by placing a clean finger into the corner of the baby’s mouth. Offering a clean teething ring before feeds may also help soothe sore gums.

When Should Baby See a Dentist?

A first dental visit should happen by the baby’s first birthday or within six months of the first tooth appearing. Early visits help check that teeth are developing properly and allow parents to ask questions about brushing, fluoride, teething, thumb-sucking, and preventing tooth decay.

Early dental visits also help children become familiar with dental care from a young age, which may reduce fear later on.

Conclusion

Breastfeeding and baby dental care can work well together. Once teeth appear, gentle brushing, healthy feeding habits, regular dental checks, and early advice can help protect a child’s smile from the very beginning. World Breastfeeding Week is a reminder that supporting mothers also means giving them practical guidance for every stage of their baby’s development. Affinity Dental offers access to dental care and support, helping members obtain professional guidance on baby teeth, early oral care, breastfeeding-related dental questions, and preventing tooth decay from the start.