Fluoride enamel stability and remineralization

Dental caries remains as one of the most prevalent noncommunicable diseases even with advances in preventive dental care. This literature-based research examines how fluoride exposure influences enamel stability and caries formation. We hypothesized that fluoride reduces caries incidence by promoting remineralization and reinforcing the crystal lattice structure. A comprehensive search was done through PubMed, ScienceDirect, Karger, and Figshare to select peer reviewed studies that evaluated fluoride and enamel interactions. Quantitative data were extracted from open access in vitro and in vivo studies that incorporated transverse microradiography, electron probe microanalysis, micro-computed tomography, and energy-dispersive spectroscopy to fully assess the lesion depth, mineral density, and fluoride's effects on dental tissues. Of the 60 studies that were screened, 23 were met with the inclusion criteria. Across all experimental models, fluoride exposure produced a consistent concentration dependent positive effect in both the enamel and the dentin. In vitro and pH cycling models carious lesion depths approximately decreased 30%-50% relative to the control. Microanalytical measurements demonstrated high fluoride accumulation within the outer enamel surface. The lattice associated fluoride concentrations increased from baseline 200 ppm to over 1,200 ppm in treatment groups. These compositional changes caused improvement in mechanical and chemical stability, where it caused a 15%-25% increase in surface microhardness and a 35%-80% decrease in mineral (Ca²⁺) loss during acid exposure. Together, the results strongly indicate that fluoride enhances enamel stability through remineralization and lattice stabilizing mechanisms that increase the resistance to acid exposure.