الفهرس 
Comparison between Caries Prevalence among Primary School Children and Fluoride Content in Drinking Water in Sana’a and Cairo Governorates
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Abstract
This study was conducted to assess caries prevalence, dental fluorosis among primary school children and fluoride concentration in drinking water. A total number of examined students of 17599, (9623 boys and 7976 girls) with an age range of 6-12 years and mean age of (8.8 ± 1.8). Dental caries was assessed according to the WHO criteria using (dmft, dft and DMFT Index), while the enamel fluorosis was assessed using Dean{u2019}s Index (WHO, 1997). A total of 146 water samples analyzed for fluoride concentration using F ion selective electrode (ISE).The results showed that the fluoride concentration ranged from (0.131 ppm) to (13.1 ppm) in different areas. The overall prevalence of dental caries was (67.6%), while the dental fluorosis was (30.1%). The caries experience decrease gradually with increasing water fluoride level from (0 to 2 ppm) then increase by increasing water fluoride level ( > 2 ppm). The fluorosis prevalence increases steadily by increasing fluoride level in the drinking water