Fluoride Exposure and Skeletal Health Effects

Fluoride is a ubiquitous trace element encountered through drinking water, diet, air and certain industrial processes. At low concentrations it contributes to enamel strengthening and normal bone mineralisation, but chronic ingestion or inhalation of elevated levels disrupts skeletal homeostasis. Excess fluoride accumulates in bone matrix, initially stimulating osteoblast activity and increasing bone density, yet prolonged exposure leads to abnormal mineral deposition, altered bone microarchitecture and joint degeneration. Clinically, skeletal fluorosis manifests as osteosclerosis, ligament calcification, joint stiffness and, in advanced stages, osteochondrosis and osteoporosis-like changes. Disease severity depends on total fluoride burden, nutritional status—particularly calcium intake—and genetic susceptibility. Worldwide, endemic fluorosis remains a public health challenge in areas with high-fluoride groundwater, coal combustion by-products or traditional beverages. Current research spans molecular mechanisms of fluoride-induced bone turnover, genetic modifiers of individual risk and strategies for exposure reduction, highlighting the need for integrated preventive measures and targeted interventions.

Research from Nature Portfolio

Recent investigations have illuminated the role of genetic variability in skeletal response to fluoride. In populations exposed to high-fluoride brick-tea consumption, a specific variant in the matrix metallopeptidase-2 gene was shown to confer substantial protection against skeletal fluorosis. Individuals carrying the protective allele exhibited lower odds of bone density alterations and reduced severity of clinical symptoms, indicating that single-nucleotide polymorphisms can modulate susceptibility. These findings pave the way for personalised risk assessment and underscore the potential for genetic screening to inform public health strategies in endemic regions.

Fluoride Exposure and Skeletal Health Effects publication trend

The graph below shows the total number of articles in fluoride exposure and skeletal health effects across all publications each year (not limited to Nature Index journals).

Technical terms

Fluoride exposure: Systemic uptake of fluoride via ingestion or inhalation over time.

Skeletal fluorosis: A chronic bone disorder characterised by abnormal hardening, density changes and joint involvement due to excessive fluoride accumulation.

Osteosclerosis: Pathological increase in bone mass and density leading to reduced bone elasticity.

Bone turnover: The continuous cycle of bone resorption by osteoclasts and bone formation by osteoblasts.

Wnt/β-catenin signalling: A molecular cascade essential for osteoblast differentiation and regulation of bone formation.

Single-nucleotide polymorphism (SNP): A genetic variation at a single DNA base that may influence individual disease susceptibility.

References

1. Matrix Metallopeptidase-2 Gene rs2287074 Polymorphism is Associated with Brick Tea Skeletal Fluorosis in Tibetans and Kazaks, China. Scientific Reports (2017).
2. Progress of Signaling Pathways, Stress Pathways and Epigenetics in the Pathogenesis of Skeletal Fluorosis. International Journal of Molecular Sciences (2021).
3. Dietary Fluoride Intake and Associated Skeletal and Dental Fluorosis in School Age Children in Rural Ethiopian Rift Valley. International Journal of Environmental Research and Public Health (2016).
4. Change of urinary fluoride and bone metabolism indicators in the endemic fluorosis areas of southern china after supplying low fluoride public water. BMC Public Health (2013).