Helpful: in the right amount, fluoride is one of the most important things protecting your child’s teeth from decay. What matters is the amount, not the fluoride itself. Use a little toothpaste, sized to their age. If a young child swallows that little bit, there’s nothing to worry about, and they learn to spit it out as they grow.
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Every time your child eats or drinks something sugary, the bacteria on their teeth turn it into acid. The acid draws minerals out of the tooth’s surface, and saliva then puts some of them back. It happens every day: the surface loses minerals and wins them back.
Fluoride gets built into that surface as it rebuilds, so it ends up better at resisting acid. In other words, every brush with a fluoride toothpaste strengthens the surface of your child’s teeth again.
Sometimes you notice a faint white patch near the gum. It can be the first sign that the surface has lost minerals, before any hole forms. At that stage, fluoride with good brushing and less sugar can help it harden again. The check-up decides whether it’s simply watched or needs something more. If a hole has already formed, this explains what comes next: A decayed baby tooth: treat it or take it out?
Most of the protection comes from fluoride that touches the surface of the tooth, from the toothpaste while it’s in the mouth, not from what gets swallowed. So the point is for it to reach the teeth and stay there a little while, not for your child to eat it.
Not with a ruler and not by numbers. By sight: the amount is small, and it grows a little as your child does.
| Approximate age | Amount of toothpaste | Who brushes |
|---|---|---|
| From the first tooth to about 3 | A thin smear, the size of a grain of rice | You brush for them |
| From about 3 to 6 | The size of a pea | They have a go, and you finish off after them |
| From about 6 onwards | The size of a pea | On their own, with you watching until about 7 |
Brushing starts with the very first tooth, not once all the teeth are in. Twice a day, and the most important one is the last thing before bed.
A young child swallows most of the toothpaste on the brush, simply because they can’t spit yet. That’s why the amount is small from the start: it protects the teeth while it’s on them, and swallowing that little is nothing to worry about. As they get a little older, teach them to spit the toothpaste out after brushing. Ask them not to rinse with lots of water, so a little fluoride stays on the teeth.
And keep the tube with you, out of their reach. The sweet taste is tempting, and toothpaste is for the brush, not for eating.
Not for young children, roughly under 6. They can’t swish and spit well yet, and they may swallow it. When they’re older, if you’d like to use one, ask at the check-up whether they need it at all.
The known effect of too much is called dental fluorosis: faint white lines or flecks on the permanent teeth. It happens when a young child swallows more fluoride than they need, again and again. At that age, their permanent teeth are still forming inside the jawbone, before they come through.
Most of it is mild: marks you only notice up close. It doesn’t hurt, and a mildly marked tooth is no weaker against decay. If it ever needs attention for the way it looks, that’s something to raise at the check-up.
And preventing it mostly takes the same toothpaste steps as above. So you’re not choosing between protection from decay and protection from marks: the same routine serves both. If your child takes any fluoride supplement, or your drinking water comes from a source you’re not sure about, mention it at the check-up.
The small smear is nothing to worry about. But if they’ve eaten much more than a brushing amount from the tube itself, or you don’t know how much: call your child’s doctor straight away. Tell them what was eaten and roughly how much. If you can’t reach the doctor, go to the nearest emergency department. The same if your child vomits, complains of tummy pain or seems unwell. And take the tube with you.
Some white spots are the very first stage of decay. Others come from a problem in how the enamel formed, with nothing to do with fluoride at all, and each one is handled differently. A check-up tells them apart, not a photo online.
Some children’s teeth are more prone to decay. Common reasons: lots of sweets and juice between meals, frequent night feeds once the teeth are through, past decay, or brushing that’s a struggle. These children may need protection on top of toothpaste. The dentist judges how at risk your child is after looking at their teeth and asking about their habits.
One form of that protection is fluoride varnish: a concentrated coating painted onto the teeth in a few minutes, with no drilling and no needle. The dentist sets how often it’s repeated, according to how at risk the teeth are. Because it’s spaced out, the risk of marks from it is low.
Ask at the check-up whether your child needs extra protection, and how often. And on night feeds, read this too: Baby bottle tooth decay: how to protect your child’s teeth.
Within six months of the first tooth, or by the first birthday, whichever comes first. Not when it hurts. At the first visit you can ask about both together: how much toothpaste, and whether extra protection is needed. More here: At what age is the first dental visit? And what happens at the visit itself is on the Children’s dentistry page.
Brush from the first toothEven if only one tooth is through. In the morning, and last thing before they sleep.
Use an amount that fits their ageA smear the size of a grain of rice for the little ones, and a pea-sized amount from about 3.
Teach them to spit, not rinseAfter brushing they spit the toothpaste out and don’t rinse with lots of water. That way a little fluoride keeps working on their teeth.
Help until they can do it aloneUntil about 7, brush with them or watch them. Small back-and-forth movements on each tooth, on the outside, the inside and the chewing surface.
Cut down sugar between mealsIt isn’t only how much, but how often. Every sugary snack or drink starts a fresh acid attack on the teeth. Water between meals is kinder to their teeth than juice.
Let the check-up decide the restWhether they need extra protection, and how often they should come. And if you spot a white or brown patch on a tooth, bring the check-up forward.
In the right amount, yes: it’s one of the most important protections for your child’s teeth against decay. The key is the amount. For the little ones, a smear the size of a grain of rice, which is nothing to worry about if swallowed. From about 3, a pea-sized amount. As they grow, they learn to spit rather than swallow. And if their teeth are more at risk than most, the dentist decides at the check-up whether they need extra protection.
On the teeth, the known effect is fluorosis: faint white lines or flecks on the permanent teeth, from swallowing too much fluoride again and again in early childhood. Most of it is mild: it doesn’t hurt, and a mildly marked tooth is no weaker against decay. For the body: if your child eats much more than a brushing amount from the tube, or you don’t know how much, call their doctor straight away, and if you can’t reach them or they vomit, go to the nearest emergency department. Preventing most of this is simple: a small amount, spitting once they can, and the tube kept out of reach.
The clearest studies linking fluoride to the brain looked at high levels in drinking water over many years. They did not look at a small smear of toothpaste on a brush, even when a little one swallows it. That’s exactly why the small amount and the spitting matter: the teeth get their protection, and what does get swallowed stays small. And if you’re still worried, raise it at the check-up and you will get an answer about your own child.
There is, but it cleans without giving the protection against decay that fluoride gives. Most ordinary toothpastes contain fluoride, and it’s listed in the ingredients on the tube. So for a young child the answer isn’t a toothpaste without it; the answer is a small amount. And if you have a reason to switch, ask the dentist first.
It can start as soon as the first teeth are through, if the dentist sees a need. How often it’s repeated is for the dentist to decide after examining them, not by age alone. Fluoride toothpaste, on the other hand, starts with the very first tooth, in the small amount.
Toothpaste fluoride does the most good when it stays on the teeth after brushing. That’s why, once they can, your child spits and doesn’t rinse with lots of water, and why the bedtime brush lets fluoride stay on the teeth longer, because there’s less saliva during sleep. Fluoride varnish stays on the teeth for a few hours after it’s applied, and the dentist tells you what they can eat afterwards and when to brush again.
Small amounts occur naturally in water and in some foods and drinks, such as tea and some kinds of fish. But what really protects the teeth is the fluoride that touches the tooth surface, meaning the toothpaste, not what is swallowed with food. So there is no need to hunt for foods with fluoride. Anything extra beyond toothpaste isn’t something to give on your own: a doctor decides, and if your child already takes one, mention it at the dental check-up.
A check-up for your child. You leave knowing how prone their teeth are to decay, how much toothpaste suits their age, and whether they need extra protection.
This is general information, not a diagnosis of your child’s case. The decision is made at the examination.
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