Ihe na-ewepu fluorine bụ ihe dị mkpa kemịkalụ nke a na-ejikarị agwọ mmiri mkpofu nwere fluoride. Ọ na-ebelata mkpokọta ion fluoride ma nwee ike ichekwa ahụike mmadụ na ahụike nke gburugburu ebe obibi mmiri. Dị ka ihe na-emepụta kemịkalụ maka ịgwọ mmiri mkpofu fluoride, ihe na-ewepu fluorine bụ nke a na-ejikarị wepụ ion fluoride na mmiri.