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Through click chemistry, triazole and triazolium groups have been explored to recognize anions through C–H···A^– hydrogen-bonding complexion. Herein, we demonstrate evidence of fluoride-induced deprotonation of a C–H bond and its application in fluoride detection. The combination of fluorene and triazolium units produced a highly selective fluorescence turn-on prototype sensor for fluoride. The interactions between the C–H bond and F^– were studied by fluorescence spectroscopy and ¹H NMR titrations. Test papers were prepared to detect fluoride in aqueous media at concentrations down to 1.9 ppm, important for estimating whether the fluoride concentration in drinking water is at a safe level.