الفهرس 
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Abstract
This study was conducted at Zagazig center to determine the prevalence of dental fluorosis and dental caries and to identify the contributing factors to dental fluorosis. total of (3600) children of both sexes, with an age ranged from 12 to15 years old (mean age was 13 ± 0.6) years old were randomly selected among the preparatory public schools at the urban and rural sectors of Zagazig centre. Ten samples of drinking tap water were collected from the selected urban and rural districts at the time of examination. Analysis of fluoride level in water was done at the General Administration of Laboratories in Mansoura city by Alizarin red method. The over all prevalence of dental fluorosis (25.6%). Regarding the severity of dental fluorosis, the very mild form was the most prevalent form, its total prevalence was (16.5%), followed by questionable form (6.5%), the fluorosis prevalence increases steadily by increasing fluoride level in the drinking water. As regards dental caries prevalence, it was found that the over all prevalence of dental caries was (38.3 %). The caries prevalence was found to increase by age. The most significant contributing variables for dental fluorosis were tooth brushing using fluoride tooth paste, high fluoride concentration in the drinking water (0.61ppm -0.90 ppm), frequently fish intake, and chicken soup intake at young age.