الفهرس 
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Abstract
Objective: - This study was conducted to determine the prevalence of dental fluorosis and associated risk factors among a group of population in Sinbillawain center.Material and method:-A cross sectional study was performed in Sinbillawain center; a total of (2600) urban and rural participants of both sexes. They filled in the prepared questionnaires and were examined using the Pathfinder survey. Age groups were (12, 15 and 35 to 44) using community Dean’s index.Result:- The results of the study showed that the overall prevalence of dental fluorosis was (94.62%) distributed as (94.10% ,95.0% and 94.71%) for (12 ,15 and 35-44 years old ) respectively with no statically significant difference . Regarding the severity of dental fluorosis, the mild form was the most prevalent, its total prevalence was (39.57%), followed by very mild form (30.42%), then questionable form (17.80%), lastly moderate from (6.76%). The CFI was (0.5), its public health significance was borderline in (12years and 35-44years), while public health significance was slight in (15 years). Regarding the Gender, there was no statistically significant difference in the prevalence of dental fluorosis among females and males. No measures of association was performed since all subjects’ source of drinking water was tap water. Mild fluorosis was the highest amongthose tooth brushing users; drinking tea; frequently eating fish; drinking commercially prepared juice and carbonated beverages.Conclusion:- Prevalence of fluorosis was high (94.62%),ranging from questionable to mild fluorosis for most of them.There was no statistically significant difference in prevalence of dental fluorosis as regarding age , gender and education level. There was no statistically significant difference in prevalence of dental fluorosis as related to tooth brushing using fluoride toothpaste, frequent eating fish, drinking commercially prepared juice and carbonated consumed beverage at any age. While there was a significant association between fluorosis and drinking tea.