Which of the following professionally applied preparations for in-office application has the highest fluoride concentration (ppm)?

Question

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Sodium varnish 5% has a fluoride concentration of 22,600 ppm.Solution,foam,gels,and varnish for in-office applications include sodium 2%,which has a fluoride concentration of 9050 ppm,and APF 1.23%,which has a fluoride concentration of 1.23%.Prescription gels for daily home use such as 0.4% SnF and 1.1% NaF in APF have a fluoride concentration of 5000 ppm.

Which of the Following Professionally Applied Preparations for In-Office Application