Primary teeth — the baby teeth that erupt from around six months and are complete by around two and a half years — are often treated as temporary and therefore less important than permanent teeth. This is a misconception that has real consequences: dental decay in primary teeth is the most common reason for hospitalisation under general anaesthetic in children aged two to five in the UK, and it is almost entirely preventable with good oral hygiene and dietary practices established from the first tooth.
Starting good tooth care habits from the moment the first tooth appears — long before a visit to the dentist — is one of the most straightforward and impactful things parents can do for their child's long-term dental health.
Healthbooq supports parents in tracking developmental milestones including teething progression, and in accessing practical guidance on infant health care.
When and How Teeth Erupt
The first tooth typically appears between six and ten months, though the range extends from four months to fourteen months or later, all of which is within normal variation. The eruption sequence is usually: lower central incisors first, then upper central incisors, then lateral incisors, first molars, canines, and second molars — though variation in order is common. By around two and a half years, most children have all twenty primary teeth.
Some babies get teeth with minimal symptoms; others show increased drooling, gum rubbing, irritability, and disrupted sleep in the days before and during eruption. A slightly elevated temperature — not above 38°C — is common during teething. Significant fever, diarrhoea, or other systemic symptoms are not caused by teething and should not be attributed to it.
How to Brush Baby Teeth
Begin brushing as soon as the first tooth appears. Use a small-headed, soft-bristled baby toothbrush and a smear (the size of a grain of rice) of fluoride toothpaste containing at least 1,000 parts per million (ppm) fluoride — standard family toothpaste meets this criterion. Specific infant toothpastes with lower fluoride concentrations are not recommended; the fluoride is important, and the small amount used is safe.
Brush for approximately two minutes twice daily — after breakfast and, most importantly, before bed. The bedtime brush is the most important because saliva flow reduces during sleep, which otherwise provides some natural protection against acid. After the bedtime brush, the child should not eat or drink anything except water.
Spitting without rinsing is the recommended technique from around age two — the toothpaste residue provides ongoing protection that rinsing removes.
Making Toothbrushing Happen
Toothbrushing refusal is common and normal in toddlers. Strategies that help include: making it part of a consistent evening routine so it becomes expected rather than negotiable; allowing the child to hold their own toothbrush and do some brushing themselves (followed by a parent completing the brushing) to give them a sense of agency; using a timer, a song, or a toothbrushing app; brushing together so the child sees the parent doing it; and trying different positions (child lying with head in parent's lap, or standing in front of a mirror).
Toothbrushing should not be optional, but it does not need to be a battle every night. The goal is to establish the habit and complete the brushing with sufficient coverage, and a range of approaches can achieve this.
First Dental Visit
The NHS recommends taking children to the dentist from when their first tooth appears. Early dental visits familiarise the child with the environment, allow the dentist to check for early signs of decay, and establish the preventive relationship that is most effective if begun before problems develop.
Key Takeaways
Good oral health habits should begin as soon as the first tooth erupts, typically between six and ten months. Brushing twice daily with a smear of fluoride toothpaste (1,000 parts per million fluoride for children under three) is the UK recommendation from first tooth. Dental decay in primary (baby) teeth is the most common reason for hospitalisation under general anaesthetic in children under five in the UK and is largely preventable. The primary drivers of early childhood caries are: frequent sugar exposure and inadequate brushing. Primary teeth matter for eating, speech development, and as space-holders for adult teeth.
