These contain a high level of fluoride (22,600 ppm) and are applied only in a dentist’s office. Varnishes are used to deliver fluoride to specific sites or surfaces within the mouth and are typically applied every 3 months or 6 months. The correct application of a fluoride varnish has been linked with a 38% reduction in dental caries.22 Varnishes are designed to harden on the tooth, forming a deposit of calcium fluoride that can act as a reservoir for the slow release of fluoride over time.
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