| Summary: | Fluoride is one of the most important elements in the composition of teeth and bones. It can enter the body through different ways. The main means of its intake is drinking water. This study was aimed at evaluation of fluorine concentration in drinking water sources in Sardasht, Rabat, and Mirabad towns. In this descriptive - analytical study, different samples of drinking water taken from the water sources in Sardasht, Rabar, and Mirabad during 15 months were analyzed using a Spectrophotometer set in a laboratory. The obtained data were statistically analyzed using SPSS software (Version 16) at the significant level (α=0.05). Results showed that fluoride concentration was below than the recommended standards at all stations sampled. Fluoride concentration did not show significant differences in different water resources of these towns (p-value> 0.05). The amount of fluorine in all water sources of Sardasht, Rabat, and Mirabad was less than the recommended minimum value, so it is an urgent necessity to try to solve the problem.
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