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Again, an ammonium fluoride solution is one of the starting materials; the silicon dioxide simply precipitates out of this solution.—ArsTechnica, 28 May 2026 The gas was captured and fed back into the loop, thereby regenerating the starting ammonium fluoride.—Mrigakshi Dixit, Interesting Engineering, 28 May 2026 Dentists can also sometimes stop cavities with fluoride varnishes and prevent them with dental sealants, which were once recommended only for children, Fontana said.—The New York Times News Service Syndicate, San Diego Union-Tribune, 26 May 2026 In the sketch, Sherman wore oversized fake teeth and mocked Wood’s Manchester accent in a line about removing fluoride from water and eating monkeys.—Larisha Paul, Rolling Stone, 29 Apr. 2026 See All Example Sentences for fluoride