Oral fluoride reservoir

The oral fluoride reservoir is a physiological and material-based system that stores and gradually releases fluoride ions to protect dental structures from decay. It primarily consists of calcium fluoride (CaF2) or 'calcium fluoride-like' mineral deposits that precipitate on the enamel surface and within dental plaque following the application of high-concentration topical fluoride treatments, such as varnishes or silver diamine fluoride (SDF) (Ten Cate, 2011 [1]; PubMed [2]). These reservoirs are highly pH-sensitive, remaining stable at neutral pH but dissolving when the oral environment becomes acidic due to bacterial metabolism, thereby releasing fluoride into the oral fluids (ResearchGate [3]). This released fluoride promotes the remineralization of enamel into fluorapatite, which is significantly more resistant to acid than the original hydroxyapatite, and inhibits bacterial enzymes like enolase to reduce further acid production (NIH [4]; NIH [5]). While the 'fluoride ion reservoir' is not a single protein, receptor, or enzyme target, its clinical establishment and maintenance are the primary therapeutic objectives of preventative dentistry and the basis for the development of bioactive 'rechargeable' materials like glass ionomer cements (ResearchGate [6]; Wikipedia [14]).

Other names

Calcium fluoride reservoirCalcium fluoride-like depositsIntraoral fluoride reservoirPlaque fluoride reservoirBioavailable fluoride reservoir

Topical fluoride agents react with oral calcium to form calcium fluoride-like precipitates on the tooth surface and in plaque; these deposits act as pH-sensitive reservoirs that dissolve during acid challenges (pH < 6.0) to release fluoride ions, which then promote enamel remineralization into acid-resistant fluorapatite and inhibit bacterial glycolytic enzymes.