Currently, there is little information available to describe the nanostructure of crystal hydroxyapatite, which contributes to influencing the macro characteristics of fluorosis-affected enamel. This research using Scanning Electron Microscopy/ Energy Disperse X-Ray (SEM/ EDX)and Powder X-ray Diffraction (XRD). The results of this study have demonstrated Fluor concentration were higher in fluorosis enamel and the surface increasingly roughness and porous. The a-axis on fluorosis-affected enamel 9.3786, and the c-axis 6.8836 . The a-axis on normal enamel 9.4148, and the c-axis 6.8791 . The...