The first tooth deserves more attention than it usually gets. Dental caries (tooth decay) is the single most common chronic health condition in childhood in the UK, affecting around 25% of 5-year-olds in some regions, and it is largely preventable. The protective habits established in the first years – fluoride toothpaste from the first tooth, limiting sugar, first dental visits – create the foundation for lifelong oral health.
Healthbooq covers infant and child health, including oral care in the early years.
Starting Tooth Brushing
Brushing should begin with the first tooth. The NHS and NICE both recommend this explicitly: there is no benefit to waiting until "there are more teeth." Every surface of every tooth that has erupted is a potential site for decay.
The recommended tools for a baby's first tooth are: a soft-bristled baby toothbrush (small head, designed for infant anatomy) and fluoride toothpaste.
Fluoride toothpaste: NHS and NICE guidance specifies that the toothpaste should contain at least 1000ppm (parts per million) fluoride. This was updated from previous guidance that recommended lower-fluoride "children's" toothpastes; the evidence now consistently shows that lower-fluoride toothpastes provide inadequate protection. Family fluoride toothpaste (typically 1350-1500ppm) is appropriate from the first tooth. A smear (the size of a grain of rice) should be used until age 3; a pea-sized amount from age 3.
Twice daily brushing: once in the morning and once last thing at night before bed. The bedtime brushing is the most protective: during sleep, saliva flow reduces significantly, and bacteria that metabolise sugar and produce acid (primarily Streptococcus mutans) have the longest uninterrupted window without the buffering effect of saliva.
After brushing at night, the mouth should not be rinsed with water – rinsing washes away the fluoride that remains on the tooth surface and provides continued protection. "Spit, don't rinse" is the recommendation.
Diet and Decay
Sugar is the substrate that oral bacteria use to produce the acid that demineralises tooth enamel. The frequency of sugar exposure – how often sugar contacts the teeth – is more clinically significant than the total amount consumed. A child who has sugary snacks five times a day exposes their teeth to acid attacks five times; a child who has a similar total sugar load in three sittings produces fewer acid challenges.
Free sugars (added sugars and sugars naturally present in fruit juice, honey, and syrups) should be avoided before age 1, in accordance with NICE guidance. After age 1, minimising sugary snacks between meals and confining juice to mealtimes reduces caries risk.
Night-time bottle use: continuing to give a bottle of milk or diluted juice after teeth have erupted significantly increases caries risk. Milk contains lactose (a sugar); repeated nocturnal exposure to lactose in a low-saliva environment is a well-established cause of "early childhood caries" (sometimes called "nursing bottle caries"). After the first tooth, milk at night should be offered in a cup rather than a bottle, and the baby should ideally go to sleep after teeth have been brushed.
First Dental Visit
The NHS recommends the first dental visit within 6 months of the first tooth appearing, or by the baby's first birthday at the latest. NHS dental care is free for children in the UK. The first visit is primarily an introduction – to the dentist, the chair, and the experience – rather than a clinical procedure. It also allows the dentist to identify any early signs of decay and to discuss diet and fluoride with parents.
Research by Kim Seow at the University of Queensland and subsequent UK-based work has confirmed that early dental visits and fluoride varnish application from age 2-3 (applied by dentists and health visitors) significantly reduce caries incidence.
Fluoride Varnish
Fluoride varnish is painted onto teeth by a dentist or suitably trained clinician and provides additional fluoride protection. NICE recommends it twice yearly from age 3 for all children, and from age 2-3 for children in high-caries-risk populations. The varnish is quick and well-tolerated.
Key Takeaways
Tooth brushing should begin as soon as the first tooth erupts, using a small smear of fluoride toothpaste containing at least 1000ppm fluoride. NHS and NICE guidance recommends twice-daily brushing, with the most important session being the last thing before bed when saliva flow is low and bacteria have the longest overnight window. Dental decay (caries) is the most common chronic health condition in childhood in the UK; it is largely preventable. Sugar is the primary dietary cause; the frequency of sugar exposure matters more than the total amount. Night-time bottle feeding with milk or juice after teeth have erupted should be discontinued.
