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Cervical myelopathy revealing bone fluorosis.

The effects of high fluoride on the level of intelligence of primary and secondary students.

DISCUSSION: The results show that the level of intelligence of primary and secondary students from the high fluoride area and that of primary and secondary students from the non-high fluoride area had very significant differences, proving that high fluoride has adverse effects on the mental development of students. The higher the water fluoride is, the lower the level of IQ. Before 6 years of age is a critical period for children’s mental development,  and it is meaningful to choose st