Tooth decay is the most common chronic disease in children worldwide, and it is almost entirely preventable. That’s not a throwaway statistic. It means that most of the tooth decay we see in children didn’t have to happen.
This article sets out the practical, evidence-based steps that parents in Surrey can take to substantially reduce their child’s risk of decay. The advice here reflects current UK clinical guidance and what we observe in practice day to day.
Understanding What Causes Decay
Tooth decay happens when bacteria in the mouth produce acid from sugar. That acid dissolves the mineral structure of enamel over time, creating cavities. The critical factor isn’t just how much sugar a child eats; it’s how often the teeth are exposed to acid throughout the day.
A child who has a biscuit with lunch is giving the mouth one acid challenge. A child who sips a fruit juice drink from a bottle throughout the afternoon is giving the mouth dozens. The frequency matters more than most parents realise. Saliva needs time between acid attacks to remineralise the enamel, and if attacks come too frequently, that recovery time is never available.
In our experience, most parents are surprised to discover that it’s the drinks, not the sweets, that cause the most damage in younger children.
Diet: What to Change and How
The goal isn’t to eliminate all sugar from a child’s diet. That isn’t realistic or necessary. The goal is to reduce the frequency of sugar exposure and to keep sweet foods and drinks to mealtimes where possible.
Water and plain milk are the only truly safe drinks for children’s teeth. All fruit juices, smoothies, squashes, fizzy drinks (including diet versions), and flavoured milks carry some risk. It’s the acid content, not just the sugar content, that damages enamel. Even unsweetened fruit juice is acidic.
| Drink or Food | Decay Risk | Notes |
|---|---|---|
| Water (plain) | None | Always the best choice; safe between meals |
| Plain milk | Very low | Contains calcium and protein; safe between meals for most children |
| Pure fruit juice (unsweetened) | Moderate to high | Acidic even without added sugar; limit to one small glass per day with a meal |
| Squash or diluted cordial | Moderate to high | Even diet versions are acidic; avoid between meals |
| Fizzy drinks (including diet) | High | Carbonation adds acid regardless of sugar content; best avoided for children |
| Sweets and chocolate | Moderate | Less damaging than frequent sipping; keep to mealtimes and brush afterward |
| Dried fruit (raisins, sultanas) | High | Sticky and high in concentrated sugar; often underestimated as a risk |
| Cheese, plain yoghurt, vegetables | Very low to none | Actively beneficial; cheese in particular helps neutralise mouth acid |
Some children receive fruit juice in a bottle or cup as a comfort drink between meals. This is one of the highest-risk practices we see in young children. Switching to water in any between-meal drink container is one of the single most effective changes a parent can make.
Brushing Routine: Getting It Right by Age
Twice-daily brushing is non-negotiable. But the correct technique and toothpaste fluoride concentration vary by age, and getting these details right matters.
As soon as the first tooth appears, it should be brushed. A smear of fluoride toothpaste (at least 1,000 ppm fluoride) on a soft-bristled brush, twice daily. Children under three need adult supervision and an adult-directed brush. Between three and six, a pea-sized amount of toothpaste is appropriate. At this age, children can begin to participate in brushing but still need an adult to finish the job.
From seven, many children can brush independently, but the evidence suggests that parental oversight, even occasional checks, still reduces decay rates in this age group. Most children won’t brush for the full two minutes without some kind of timer or encouragement. Some families use a two-minute song, a kitchen timer, or an electric toothbrush with a built-in timer. The method doesn’t matter. The consistency does.
Don’t rinse after brushing. Spitting out the excess toothpaste is fine, but rinsing with water washes away the fluoride film that should remain on the teeth to continue working. This is one of the most common mistakes we see, and it’s one of the easiest to correct.
The NHS guidance on children’s teeth covers brushing recommendations in detail and is a reliable reference for parents who want to check their approach.
Flossing
Flossing becomes relevant once teeth are touching each other, which can happen as early as age two or three for some children. Where teeth are in contact, a toothbrush cannot reach the surfaces between them. Those surfaces are where decay frequently develops, and where it’s least visible until it’s already progressed.
Children won’t floss independently until around age eight to ten. Before that, a parent needs to do it. Floss picks designed for children make this significantly easier than traditional floss.
Fissure Sealants
The chewing surfaces of back teeth have deep grooves, called fissures, that are difficult to clean thoroughly with a toothbrush. Fissure sealants are a thin protective coating applied to those surfaces, physically blocking the grooves so that bacteria and food debris can’t accumulate there.
They’re typically applied to the first permanent molars as soon as they erupt, around age six to seven, and to the second permanent molars around age twelve. The application is quick, painless, and doesn’t require any drilling. Sealants don’t last forever: on balance, they last somewhere between five and ten years before they need replacing or reapplying. But during those years, they substantially reduce decay risk on the surfaces they protect.
Fluoride Varnish
Applied by a dental professional twice yearly (or more often for higher-risk children), fluoride varnish provides a concentrated fluoride treatment directly to the tooth surface. It’s one of the most evidence-supported preventive interventions available for children. The Delivering Better Oral Health toolkit, published by the UK government, recommends it as a standard part of preventive dental care for children.
But varnish works best as part of a full prevention programme, not as a standalone fix. A child who brushes well, eats sensibly, and attends check-ups regularly will benefit from varnish. A child who is consuming high-sugar drinks throughout the day won’t be protected by varnish alone.
Start Early, Stay Consistent
Children who begin attending dental check-ups in the first year of life and maintain regular attendance have significantly lower decay rates than those who first attend in response to pain or a visible problem. A check-up is a preventive appointment. And prevention, in dentistry as in most areas of health, is always more straightforward and less costly than treatment.
If you’d like help with your child’s oral health at a practice that takes prevention seriously, Coniston Dental Practice in West Byfleet offers private children’s dentistry with a genuine focus on keeping decay away. NHS dental care is free for all children under 18 in England; we’re happy to discuss both options with you. Call us on 01932 343675 to book an appointment or ask any questions.
