Objective: This study was conducted to determine the prevalence of dental fluorosis and risk factor among  a group of population in Sinbillawain center . Materials and Methods:A cross sectional study was performed in Sinbillawain center; a total of (2600) urban and rural cities of both sexes were  examined using the Pathfinder" survey age groups (12, 15  and 35 to 44) in Sinbillawain center, using Dean's index. Results: The results of the study showed that the overall prevalence of dental fluorosis was (94.62%) distribution 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 prevalence form , 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 ,the results of the present study 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 among user  tooth brushing . Conclusions: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 and gender . There was no statistically significant difference in prevalence of dental fluorosis as related tooth brushing using fluoride toothpaste  ,frequently intake of fish at any age.   Keywords:Dental Fluorosis ;Fluoride Intake ;Beverages ;Toothpaste.