Fluoride-releasing materials can take up fluoride ions from the oral environment as a means of replacing fluoride which has been lost. The recharge of fluoride may contribute to the ability of these materials to provide a long-term inhibitory effect on enamel demineralization, because the recharged fluoride is released again and presumably contributes to continuous prevention of enamel demineralization.
In addition, the recharge capacity could be significantly influenced by different recharging protocols. Some of the fluoride recharging protocols are application of fluoride varnish, or tooth paste.
REF: JOURNAL OP DENTISTRY ,39 ,2011
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