[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Pharmacology](https://durgical.com/en/pharmacology/) › [Minerals](https://durgical.com/en/pharmacology/classes/minerals/) › Fluoride

# Fluoride

## Minerals?

Minerals

A mineral that hardens tooth enamel and helps repair early decay. Given in water, toothpaste and varnish; too much in early childhood causes fluorosis.

Updated Nov 1, 2026

Also called: sodium fluoride

## Quick facts

**Group**
[Minerals](https://durgical.com/en/pharmacology/classes/minerals/)

**Target**
Tooth enamel (hydroxyapatite crystals)

**Used for**
Prevention of dental caries

**Key effects**
Dental fluorosis

**Monitor**
Caries in dental check-ups

**ATC**
A12CD01

No doses: the clinician sets them by the current guideline.

On this page

- The basics Mechanism of action
- Indications
- Adverse effects
- Pharmacokinetics
- Memory aid

- Safety Contraindications
- Key interactions
- What is monitored
- Administration and safety
- Pregnancy and breastfeeding
- Nursing care

- Study Test yourself

- Connections Connections

## Mechanism of action

Acid made by mouth bacteria after eating dissolves minerals from enamel. Fluoride in saliva and on the tooth surface helps put the minerals back (remineralisation), and enamel that has taken up fluoride is harder for acid to dissolve. Fluoride may also reduce acid production by bacteria. Teeth need a steady low level of fluoride; fluoride taken up before a tooth erupts also makes it more resistant later.

- Bacterial acid dissolves enamel minerals
- Fluoride helps redeposit minerals (remineralisation)
- Fluoride-rich enamel resists acid; fewer cavities

## Indications

- Prevention of dental caries (community water, toothpaste, varnish, rinses, gels) [Dental caries →](https://durgical.com/en/conditions/dental-caries/)

## Adverse effects

### Common

- Dental fluorosis: faint white lines or streaks on enamel when young children get too much before teeth erupt

### Serious (rare, important)

- Fluorosis in children who repeatedly swallow mouth rinse

## Contraindications

- Mouth rinses are not for young children who may swallow them
- Young children use only a small smear of toothpaste and spit it out

## Key interactions

**Other fluoride sources (fluoridated water, toothpaste, supplements, rinses)**
Total intake adds up; excess in early childhood causes fluorosis

## What is monitored

- Caries in dental check-ups
- White streaks on the teeth of young children (excess)

## Administration and safety

- Varnish is applied by a dental or health professional and must be reapplied regularly.
- Children brush with supervision and spit out the toothpaste.

## Pregnancy and breastfeeding

Fluoride in water and toothpaste is part of normal oral health in pregnancy.

## Nursing care

- Ask whether the household water is fluoridated or comes from a well.
- Teach caregivers the right amount of toothpaste for the child's age.
- Encourage brushing at least twice a day and regular dental visits.

## Pharmacokinetics

**Distribution**
Stored mainly in bones and teeth as calcium fluoride

## Memory aid

«Fluoride Fills the gaps»: it puts minerals back into acid-worn enamel; too much, too young, leaves white streaks.

## Test yourself

Think of the answer, then tap the question to see it.

## How does fluoride prevent caries?

It helps remineralise enamel and makes it harder for acid to dissolve.

## What is dental fluorosis, and when does it happen?

White lines or streaks on enamel from too much fluoride while teeth are forming in early childhood.

## Who applies fluoride varnish?

A dental or health professional; it is reapplied regularly.

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## Connections

## Related drugs 1

- [Zinc sulfate](https://durgical.com/en/pharmacology/zinc-sulfate/)

## Related conditions 1

- [Dental caries](https://durgical.com/en/conditions/dental-caries/)

[← Back to the class: Minerals](https://durgical.com/en/pharmacology/classes/minerals/)

Educational content on how drugs work; not a prescribing guide and no substitute for a health professional's advice. No doses are given.

Sources: [About Fluoride | Oral Health | CDC](https://www.cdc.gov/oral-health/prevention/about-fluoride.html) (U.S. Centers for Disease Control and Prevention (CDC), 2026); [Fluoride in diet: MedlinePlus Medical Encyclopedia](https://medlineplus.gov/ency/article/002420.htm) (MedlinePlus (U.S. National Library of Medicine), 2026); [ATCDDD - ATC/DDD Index](https://atcddd.fhi.no/atc_ddd_index/?code=A12CD01) (WHO Collaborating Centre for Drug Statistics Methodology, 2026).

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Representative model, for educational purposes only.

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Source: https://durgical.com/en/pharmacology/fluoride/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/pharmacology/fluoride/