Fluoride causes increased urinary iodine levels

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Increased fluoride levels are associated with a lowering of serum iodine levels, and higher iodine excretion rates. (The basis for the fluoride treatment in cases of iodine-induced hyperthyroidism). This can be seen in urinary iodine (UIC) levels. Serum fluoride levels correlate with UIC levels.

Here is another graph by Shashi and Singla (2013).