Quick clinic trivia: which has the highest fluoride concentration we use for caries prevention, and what are the typical ppm ranges for OTC toothpaste, Rx toothpaste, and 5% NaF varnish? I tell students that 5% varnish is around 22,600 ppm to frame patient education about why a thin coat matters and why post-brush rinsing habits affect uptake.
Varnish is highest (about 22,600 ppm); OTC 1,000–1,500, Rx 5,000 — spit, don’t rinse after brushing; source: https://www.cdc.gov/oralhealth/prevention/fluoride-varnish.html.
Agree — add that 1.23% APF gel is about 12,300 ppm; quick dry before varnish boosts uptake, @kdavis_92.