Parents ask us about fluoride more than they used to, usually having read something online and come away uneasy. It is a fair question and it deserves a straight answer rather than a dismissal.
What fluoride does to a tooth
Enamel is a crystal. Acid from bacteria strips minerals out of it, and saliva puts minerals back. Decay happens when the stripping outpaces the repair.
Fluoride does two useful things. It joins the repair process, and the enamel it helps rebuild is a slightly different, tougher crystal that dissolves at a lower pH than the original. It also interferes with the bacteria's ability to produce acid in the first place.
That is the whole mechanism. It is not a medicine the child swallows for a systemic effect; the benefit is overwhelmingly local, happening at the surface of the tooth while the toothpaste is in contact with it.
Which explains the single most useful piece of advice we give
Spit, don't rinse.
If you rinse with water after brushing, you wash away the thin film of fluoride that would otherwise sit on the teeth working for the next hour or two. Encourage children to spit out the excess and stop there. It takes a while to get used to and it is probably worth more than any other change you could make.
The amounts that actually matter
This is where most of the online worry comes from, and it is about dose rather than the substance itself.
Under three: a smear of toothpaste, the size of a grain of rice, containing at least 1,000ppm fluoride.
Three to six: a pea-sized amount.
Six and over: a pea-sized amount of standard family toothpaste.
Supervise brushing until about seven, partly for technique and partly so you know how much went on the brush and how much was swallowed. Keep the tube out of reach of small children — toothpaste tastes pleasant and a toddler with access to a tube is the realistic hazard, not the brushing itself.
The thing that genuinely can go wrong
Consistently swallowing too much fluoride while the adult teeth are forming, roughly under the age of six, can cause fluorosis — faint white flecks or lines in the enamel of the adult teeth. In its mild form it is a cosmetic finding that most people never notice.
It comes from swallowing toothpaste habitually, not from brushing with the correct amount. Hence the rice grain, the supervision and the tube on a high shelf.
Set against that: tooth decay remains one of the most common reasons children in this country are admitted to hospital for a general anaesthetic. That is the actual comparison being made.
Fluoride varnish at the practice
You may be offered a varnish for your child, usually two to four times a year. It is a sticky, concentrated fluoride painted onto the teeth in about a minute. It sets on contact, tastes of not very much, and needs no injection or drill.
It is applied to the tooth surface and the quantity involved is small. Children are asked to avoid brushing until the next morning so it stays put. Where a child has had decay before, or has deep grooves, or finds brushing difficult, it is one of the more effective preventive measures available.
We will always tell you what we are recommending and why, and you are entitled to decline it.
If you would rather not use fluoride
Some families prefer to avoid it, and we would rather know than be told what we want to hear.
If that is your position, the other levers become considerably more important: how often sugar appears rather than how much, sealants on the deep grooves of new molars, thorough brushing along the gum line, and more frequent check-ups so anything starting is caught while it is still reversible. We will work with you on that.
Children's care here is led by Dr Natasha Davé, a dentist with specialty paediatric experience, including years at Birmingham Dental Hospital and Birmingham Children's Hospital — and she is happy to talk any of this through properly rather than in the last two minutes of an appointment.
Want us to take a look? Here are three ways to start, whichever suits you:
- Book online, right now — book your child's appointment in a couple of taps.
- Message us on WhatsApp — 07512 582 750. Send a photo if you like; it's often the quickest way to get a straight answer.
- Or simply call — 0121 354 7570.
Sutton Dental Care — Aesthetics · Implants · Excellence. General guidance; individual advice follows a clinical assessment.
