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a salt of hydrofluoric acid; see hydrogen fluoridehydrogen fluoride,
chemical compound, HF, a colorless, fuming liquid or colorless gas that boils at 19.54°C;. It is miscible with water and is soluble in benzene, toluene, and concentrated sulfuric acid.
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. See also fluoridationfluoridation
, process of adding a fluoride to the water supply of a community to preserve the teeth of the inhabitants. Tooth enamel ordinarily contains small amounts of fluorides and when the amount is augmented through the intake of fluoridated water, especially during the
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; fluorinefluorine
, gaseous chemical element; symbol F; at. no. 9; at. wt. 18.9984; m.p. −219.6°C;; b.p. −188.14°C;; density 1.696 grams per liter at STP; valence −1. Fluorine is a yellowish, poisonous, highly corrosive gas.
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a compound of fluorine with other elements. The fluorides of elements in Groups I and II of Mendeleev’s periodic system are solids with an ionic element—fluorine bond; the fluorides of most elements in Groups VI–VII are gases with a covalent element—fluorine bond. Compounds containing a C—F bond form numerous classes of fluorocarbons; the higher fluorides of many metals, such as U, V, Mo, W, and Re, are volatile substances. Fluorides occur in nature as constituents of minerals. In terms of chemical properties, the fluorides of halogens, inert gases, oxygen, nitrogen, and many other elements in higher oxidation states (for example, PtF5, CoF3, and AgF2) are oxidizing agents; the fluorides of arsenic, antimony, and boron are strong Lewis acids (seeACIDS AND BASES).

Fluorides can be obtained by the interaction of fluorine with elements, by the action of hydrogen fluoride on metals, and by other methods.

Hydrogen fluoride, oxyfluorides, and nitrogen fluorine compounds are widely used. The chlorine fluorides C1F3 and C1F5 are rocket-fuel oxidizing agents; C1F3 also serves as a fluorinating agent in the preparation of uranium hexafluoride, UF6, which is used in the atomic industry for the isotope separation of uranium. The volatile fluorides of metals are used in the application of metallic coatings. The fluorides of lithium, magnesium, calcium, strontium, barium, and other metals are used as raw materials in the manufacture of optical glass. (See alsoCRYOLITE.)


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(inorganic chemistry)
A salt of hydrofluoric acid, HF, in which the fluorine atom is in the -1 oxidation state.


1. any salt of hydrofluoric acid, containing the fluoride ion, F--
2. any compound containing fluorine, such as methyl fluoride
References in periodicals archive ?
OHI and 5% sodium fluoride varnish every 3 months, 0.
And in September 2015, fluoride varnish was added to the Bright Futures Guidelines for Health Supervision of Infants, Children, and Adolescents and integrated into the Bright Futures--AAP periodicity schedule.
Salivary fluoride levels following application of fluoride varnish or fluoride rinse.
Both recommended interventions are supported by good evidence, although no study directly assessed the appropriate ages at which to start and stop the application of fluoride varnish or the optimal frequency of applications.
Designed to Smile offers toothbrushing and fluoride varnish programmes for young children in their schools and nurseries, helping children and their families to keep their teeth healthy as they grow older.
Studies of Wisconsin's Medicaid program, which used pre-post designs, found that M-PCP reimbursement was associated with increased claims rates for fluoride varnish treatment with almost one-half of the increase associated with M-PCPs (Okunseri et al.
However, the use of fluoride bonding material (75%), fluoride gel (60%) and fluoride varnish (62%) as a preventive agent was occasional among majority of orthodontists.
The Scottish Intercollegiate Guidelines Network recommendations also call for kids' teeth to be coated with fluoride varnish twice a year and for under-threes to use only a smear of paste.
Some teeth may be filled, and some may just need a fluoride varnish to arrest the decay.
In 2002 he began training 65 local dentists and volunteers to work in clinics in Quito and in the remote city of Ibarra, putting sealants and, later, using fluoride varnish on teeth, and handing out toothbrushes and tooth-paste.
First Tooth will train staff at two local pediatric offices and at the county's two health clinics to include basic dental care - such as oral exams and applying fluoride varnish to teeth - with the medical services they offer their Oregon Health Plan patients age 6 and younger.