sodium fluoride sodium fluoride sodium fluoride (naf) is an inorganic compound with the formula naf. it is a colorless or white solid that is readily soluble in water. it is used in trace amounts in the fluoridation of drinking water to prevent tooth decay, and in toothpastes and topical pharmaceuticals for the same purpose. in 2020, it was the 265th most commonly prescribed medication in the united states, with more than 1 million prescriptions. it is also used in metallurgy and in medical imaging. sodium fluoride names pronunciation /ˌsoʊdiəm ˈflʊəraɪd/ iupac name sodium fluoride other names florocid identifiers cas number 7681-49-4 y chebi chebi:28741 y chembl chembl1528 y chemspider 5045 y echa infocard 100.028.789 ec number 231-667-8 kegg c08142 n pubchem cid 5235 rtecs number wb0350000 unii 8zyq1474w7 y un number 1690 comptox dashboard (epa) dtxsid2020630 inchi inchi=1s/fh.na/h1h;/q;+1/p-1 ykey: puzpdowcwnuukd-uhfffaoysa-m yinchi=1/fh.na/h1h;/q;+1/p-1key: puzpdowcwnuukd-rewhxwofah properties chemical formula naf molar mass 41.988173 g/mol appearance white to greenish solid odor odorless density 2.558 g/cm3 melting point 993 °c (1,819 °f; 1,266 k) boiling point 1,704 °c (3,099 °f; 1,977 k) solubility in water 36.4 g/l (0 °c); 40.4 g/l (20 °c); 50.5 g/l (100 °c) solubility slightly soluble in hf, ammonia negligible in alcohol, acetone, so2, dimethylformamide vapor pressure 1 mmhg @ 1077 °c magnetic susceptibility (χ) −16.4·10−6 cm3/mol refractive index (nd) 1.3252 structure crystal structure cubic lattice constant a = 462 pm molecular shape octahedral thermochemistry heat capacity (c) 46.82 j/(mol k) std molarentropy (s⦵298) 51.3 j/(mol k) std enthalpy offormation (δfh⦵298) -573.6 kj/mol gibbs free energy (δfg⦵) -543.3 kj/mol pharmacology atc code a01aa01 (who) a12cd01 (who),v09ix06 (who) (18f) hazards ghs labelling: pictograms signal word danger hazard statements h301, h315, h319, h335 nfpa 704 (fire diamond) 3 0 0 flash point non-flammable lethal dose or concentration (ld, lc): ld50 (median dose) 52–130 mg/kg (oral in rats, mice, rabbits) niosh (us health exposure limits): pel (permissible) twa 2.5 mg/m3 rel (recommended) twa 2.5 mg/m3 idlh (immediate danger) 250 mg/m3 (as f) safety data sheet (sds) related compounds other anions sodium chloridesodium bromidesodium iodidesodium astatide other cations lithium fluoridepotassium fluoriderubidium fluoridecaesium fluoridefrancium fluoride related compounds tasf reagent except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references uses sodium fluoride is sold in tablets for cavity prevention dental caries