# fluoride

/ˈfɫɔˌɹaɪd/ (US) · /flˈɔːɹaɪd/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/fluoride
Updated: 2026-05-07

## Definition

a chemical substance often added to toothpaste and drinking water to help keep your teeth strong and prevent decay.

For teachers: a chemical compound containing fluorine, typically used in public health to strengthen tooth enamel and reduce dental caries.

## Examples

- Most dentists recommend using a toothpaste that contains fluoride.
- The city council debated whether to continue adding fluoride to the local water supply to improve public dental health.
- While fluoride is naturally occurring in many water sources, its concentration is often adjusted in municipal systems to reach levels proven to inhibit the demineralisation of tooth enamel.

## Usage notes

- Uncountable in its general sense; can be countable when referring to specific chemical salts in a laboratory context.

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