Fluoride Toxicity Mechanisms in Dental Health

Fluoride plays a paradoxical role in dental health, offering caries prevention at low concentrations but causing enamel defects and hypomineralisation when ingested excessively. The primary cellular targets of fluoride toxicity are ameloblasts, the specialised cells responsible for enamel formation. Excessive fluoride disrupts protein synthesis and secretion by triggering endoplasmic reticulum (ER) stress and activating the unfolded protein response, which can culminate in apoptosis and impaired enamel maturation. Concomitantly, fluoride influences gene expression through epigenetic modifications, notably alterations in histone acetylation patterns, leading to dysregulation of pro- and anti-apoptotic pathways. Fluoride exposure also perturbs cellular metabolism, engaging stress-responsive signalling cascades such as hypoxia-inducible factor-1 (HIF-1) and glycolytic flux, with downstream effects on enamel matrix processing. In parallel, emerging evidence suggests that systemic fluoride levels can modulate the oral microbiome, potentially exacerbating periodontal risk in fluorosis-affected populations. Understanding these interlinked mechanisms is critical for refining public health guidelines on fluoride exposure, optimising preventative strategies, and developing targeted interventions to mitigate dental fluorosis worldwide.

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Fluoride Toxicity Mechanisms in Dental Health publication trend

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Technical terms

Ameloblast: A specialised epithelial cell responsible for the secretion and mineralisation of dental enamel during tooth development.

Dental fluorosis: A condition characterised by hypomineralised, porous enamel resulting from chronic overexposure to fluoride during tooth formation.

Endoplasmic reticulum (ER) stress: A cellular state in which misfolded proteins accumulate in the ER, triggering adaptive signalling pathways known as the unfolded protein response.

Histone H3K27 acetylation: An epigenetic modification of the histone H3 protein at lysine 27 that typically promotes gene transcription by loosening chromatin structure.

Microbiome: The community of microorganisms inhabiting a defined environment, such as the oral cavity, which can influence host health and disease.

HIF-1 signalling pathway: A cellular response mechanism activated by low oxygen or metabolic stress, mediated by hypoxia-inducible factor-1, which regulates genes involved in energy metabolism and survival.

References

1. Fluoride Induces Endoplasmic Reticulum Stress and Inhibits Protein Synthesis and Secretion. Environmental Health Perspectives (2008).
2. Fluoride Alters Gene Expression via Histone H3K27 Acetylation in Ameloblast-like LS8 Cells. International Journal of Molecular Sciences (2024).
3. Role of Glycolysis/Gluconeogenesis and HIF-1 Signaling Pathways in Rats with Dental Fluorosis Integrated Proteomics and Metabolomics Analysis. International Journal of Molecular Sciences (2022).
4. Saliva microbiome alterations in dental fluorosis population. Journal of Oral Microbiology (2023).