A topical form of fluoride (usually sodium fluoride) in a resin base. The concentration of fluoride may be as high as 22,600 ppm and there is therefore a potential risk of toxicity. It is professionally applied as a sticky yellowish or clear protective coating to the susceptible dried tooth surfaces in situations where the caries experience or risk is considered high. It hardens on contact with saliva. It is also used to reduce root hypersensitivity. Contact with bleeding tissues may result in contact allergy. Trade names: Duraphat, Fluor Protector.
Richards D. Fluoride varnish should be part of caries prevention programmes. Evid Based Dent 2006;7(3):65–6.