Early childhood caries is tooth decay in babies and toddlers, and it is more common than many parents expect. Around 2 in 5 Australian children aged 5 to 10 have had decay in their baby teeth, and it can start much earlier, with decay found in some children by around 18 months. Once called baby bottle tooth decay, it often starts on the upper front teeth and is strongly linked to frequent sugary drinks and to falling asleep with a bottle. The good news is that it is largely preventable with a few simple habits.
This guide explains how it happens, what to look for, and the steps that protect young teeth.
Key takeaways
- Early childhood caries is decay in the baby teeth of children under six.
- It is strongly linked to frequent sugary drinks and to sleeping with a bottle of milk or juice.
- Early signs are white or brown lines along the gum on the upper front teeth.
- Baby teeth matter for eating, speech and holding space for adult teeth.
- Simple habits and an early first dental visit prevent most cases.
How it happens
Decay is caused by bacteria in the mouth turning sugar into acid, which dissolves the enamel. In babies and toddlers the biggest risk is how often the teeth are exposed to sugar rather than the total amount. Sipping juice or sweetened milk throughout the day, or falling asleep with a bottle, bathes the teeth in sugar for long periods, especially overnight when saliva flow drops and cannot wash it away. Our guide to how sugar causes decay explains the acid-attack process.
Early warning signs
The first sign is often a dull white line along the gumline of the upper front teeth, which is early decay before a hole forms. If it progresses, the marks turn yellow or brown, and teeth can chip or develop visible cavities. Because it can be painless at first, it is easy to miss, which is why lifting your child’s lip to check the front teeth now and then is a useful habit. Early white-spot decay can sometimes be halted or reversed, as our guide on reversing early decay explains.
Why baby teeth matter
It is a common myth that baby teeth do not matter because they fall out. In fact they are needed for chewing, for clear speech, and to hold space so the adult teeth come through in the right place. Decay in baby teeth can cause pain, infection and disturbed sleep, and can affect the adult teeth forming underneath. Treating decay in a very young child can also be difficult, so prevention is far better.
How to prevent it
A handful of habits prevent most early decay.
| Step | Why it helps |
|---|---|
| Avoid bottles in bed | Stops teeth bathing in sugar overnight |
| Only water or plain milk in bottles | Cuts frequent sugar exposure |
| Move to a cup from around 12 months | Reduces prolonged sipping |
| Clean teeth twice a day | Removes plaque and adds fluoride |
| Limit juice and sweet drinks | Water and milk are best between meals |
Start cleaning as soon as the first tooth appears, using a soft brush. Follow current advice on the right amount and strength of children’s fluoride toothpaste for your child’s age. As the back teeth come in, ask about sealants and about fluoride varnish, which is applied at check-ups to strengthen enamel.
When to start dental visits
The general advice is a first dental visit by around the first birthday, or when the first tooth appears. Early visits are short and friendly, help spot problems while they are small, and get your child used to the dentist. Our first visit guide explains what happens. Eligible families may also have some children’s dental costs covered under the Child Dental Benefits Schedule.
Frequently asked questions
What causes baby bottle tooth decay?
Frequent contact between teeth and sugary drinks, especially falling asleep with a bottle of milk, formula or juice. The sugar feeds bacteria that produce enamel-dissolving acid, particularly overnight.
Can I put my baby to bed with a bottle of milk?
It is best avoided once teeth are present. Milk contains natural sugars, and pooling around the teeth all night raises the decay risk. Offer the bottle before bed and clean the teeth afterwards, or use water in bed.
My toddler has white marks on their front teeth. Is that decay?
It can be an early sign. Dull white lines along the gumline are often the first stage of decay and are worth a dental check, as early lesions can sometimes be halted with fluoride and better habits.
Do baby teeth really need fillings if they fall out anyway?
Sometimes yes. Untreated decay can cause pain and infection and can affect the adult teeth developing underneath. A dentist will advise the best approach for your child.
When should my child first see a dentist?
By around their first birthday, or when the first tooth comes through. Early, positive visits help prevent problems and build comfort with dental care.
The takeaway
Early childhood caries is common but largely preventable. Keep bottles out of bed, offer water or plain milk, move to a cup from around a year, clean teeth twice a day, and start dental visits early. Catching the first white marks early can stop decay before a hole forms. To book your child in, see our current offers or read our first visit guide.
This article is general information and not a substitute for an individual dental assessment.
