Public Health · single question
Which property of fluoride is MOST relevant to its cariostatic effectiveness?
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Correct answer: C. Substantivity (prolonged retention at tooth surface)
SUBSTANTIVITY = fluoride's ability to bind to tooth surfaces and be slowly released over time. High substantivity ensures prolonged protective effect. Why fluoride varnish is effective despite periodic application — it binds tightly to enamel and releases fluoride slowly.