# Sodium Fluoride

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**Safety rating:** AVOID
**CAS number:** 7681-49-4
**Category:** stabilizer
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-04

## Summary

Sodium fluoride (CAS 7681-49-4) is an inorganic compound historically used as a stabilizer and thickening agent in food processing. It is not currently approved as a food additive by the FDA and has limited modern food applications due to its primary association with dental and pharmaceutical uses.

## Regulatory status

| Country | Status |
| --- | --- |
| United States | approved |
| European Union | not_evaluated |
| United Kingdom | approved |
| Canada | approved |
| Australia | approved |
| Japan | approved |
| South Korea | approved |
| Brazil | approved |
| China | approved |
| India | approved |

## Detailed analysis

## What is Sodium Fluoride?

Sodium fluoride is an inorganic salt compound composed of sodium and fluoride ions. It appears as a white crystalline powder and is soluble in water. While chemically distinct from organic fluorine compounds, sodium fluoride has been investigated for various industrial and food applications. The compound has a long history of use in dental products and water fluoridation programs, where it functions to strengthen tooth enamel.

## Common Uses

In historical food processing contexts, sodium fluoride was explored as a stabilizer and thickening agent. However, its use in food products is extremely limited in modern food manufacturing. The compound is far more commonly encountered in dental care products, pharmaceutical formulations, and water treatment. Some industrial applications include metal surface treatment and glass production. The transition away from sodium fluoride in food appears related to both regulatory restrictions and the availability of alternative additives with established safety profiles and clearer regulatory pathways.

## Safety Assessment

Sodium fluoride toxicity depends heavily on dose and exposure route. The FDA has not classified sodium fluoride as Generally Recognized as Safe (GRAS) for food use, which is a significant regulatory barrier. The FDA database shows zero adverse events and zero recalls associated with sodium fluoride as a food additive, though this may reflect its minimal current food use rather than extensive safety evaluation.

Toxicological studies indicate that fluoride compounds have a narrow margin between beneficial and harmful doses. Acute toxicity depends on the amount ingested; small amounts from dietary sources and water fluoridation are considered safe, while large doses can cause adverse effects. Chronic exposure concerns center on skeletal and dental fluorosis with excessive intake. The U.S. Environmental Protection Agency (EPA) established a maximum contaminant level (MCL) of 4 mg/L for fluoride in drinking water to prevent dental fluorosis.

Key considerations include the distinction between naturally occurring fluoride in foods and added sodium fluoride as a food additive. The lack of FDA-GRAS status suggests that manufacturers have not pursued approval, possibly due to safety-benefit analysis favoring alternative stabilizers with less regulatory complexity.

## Regulatory Status

Sodium fluoride is not approved as a food additive by the FDA and does not hold GRAS status for food applications. This represents a clear regulatory restriction on its use in food products sold in the United States. The European Food Safety Authority (EFSA) similarly does not list sodium fluoride among approved food additives. By contrast, sodium fluoride is approved for use in dental products and in some jurisdictions for water fluoridation as a public health measure, reflecting different regulatory frameworks for different applications.

The absence of approval for food use may reflect both historical regulatory decisions and the availability of safer, more accepted alternatives for stabilization and thickening functions. Manufacturers typically choose additives with established GRAS status or approved food additive status to ensure market access and regulatory compliance.

## Key Studies

Scientific literature on sodium fluoride primarily addresses dental health and water fluoridation rather than food applications. The National Institutes of Health and CDC have published extensive research on fluoride safety at various exposure levels. Studies on dental fluorosis and skeletal effects of chronic high-dose fluoride exposure inform regulatory decisions about acceptable fluoride intake levels.

The lack of published food safety studies specific to sodium fluoride as a food stabilizer reflects its limited use in this application. Regulatory agencies generally rely on chemical toxicology data, historical use patterns, and comparative safety assessments with approved alternatives when evaluating additives.

## Sources

- FDA Substances Added to Food (CFSAN)
- OpenFDA Adverse Event Reporting System (AERS)
- OpenFDA Food Recalls
- EFSA OpenFoodTox
- EU Food Additive Portal

## Citation

Additive Facts. "Sodium Fluoride — Safety, regulation, and evidence." https://additivefacts.com/additives/sodium-fluoride. Accessed 2026-05-20.