Fluoride
Fluoride is the ionic form of the element fluorine, found in drinking water, tea and seafood. The body builds it into tooth enamel and bone.
What it is studied for
The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.
Why does fluoride matter for teeth?
Fluoride helps protect tooth enamel against decay. Dental products deliver it to the tooth surface, while water, food and swallowed products contribute to total intake. These routes need to be distinguished when assessing benefits and excess exposure. 1 2
Why people take it
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
Questions people ask
Should adults add tablets to toothpaste?
German guidance calls for assessing existing fluoride sources before prescribing tablets. A dental product and an oral supplement are not automatically complementary. 3
Is the EFSA safe level a target intake?
No. It is a safety value for total ingestion, not an instruction to consume that amount. 2
Is fluoride a proven osteoporosis supplement?
The cited clinical evidence is conflicting, and one one-year trial found no improvement in bone density. 1
Why check drinking water first?
DGE’s recommendations for additional fluoride depend partly on the fluoride concentration already present in water. 3
Sources
- Fluoride: Fact Sheet for Health Professionals NIH Office of Dietary Supplements
- Fluoride safety: updated intake levels for all ages European Food Safety Authority, 2025
- FAQ Fluorid Deutsche Gesellschaft für Ernährung
