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Material guide

Fluoride (Professional Gels, Foams & Varnish)

Fluoride strengthens enamel and repairs early acid damage through remineralisation, helping reduce the process that leads to tooth decay.

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The short answer

Fluoride is a naturally occurring mineral that strengthens enamel and helps repair acid damage through remineralisation. That action supports enamel before acid damage develops into more extensive decay.

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Fluoride (Professional Gels, Foams & Varnish) dental educational illustration

What is fluoride?

How fluoride protects teeth
ActionPatient meaning
Strengthens enamelMakes the tooth surface more resistant to cavities[2]
Remineralises enamelRepairs some damage caused by acids[2]

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How does it prevent decay?

Mouth bacteria use sugars to produce acids that attack enamel. Fluoride helps repair the acid damage before it develops into more extensive tooth decay.

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Where do people get it?

Fluoride reaches teeth through foods and drinks, fluoride toothpaste, tap water where it is fluoridated, and professional fluoride treatment.

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How does varnish differ from daily exposure?

Fluoride varnish is a professional topical application. In permanent teeth, a systematic review found an average prevented fraction of 30% compared with untreated controls, with results ranging from 0% to 69%.

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Why does it matter for children?

Fluoride can strengthen baby teeth before they erupt and can rebuild damage after the teeth appear, giving children both systemic and topical benefits.

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What is known about fluoride varnish?

Evidence for preventing decay with professional fluoride varnish is limited in permanent teeth and inconclusive in primary teeth and adults. The review called for better-quality clinical research.

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Fluoride varnish findings
GroupFinding
Permanent teethAverage prevented fraction 30% versus untreated controls[2]
Primary teeth and adultsEvidence was inconclusive[2]

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Frequently asked questions

Does fluoride only help after teeth have erupted?

No. Fluoride can benefit baby teeth before eruption and can repair enamel damage after teeth appear.

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Keep reading

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