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The radula is a ribbon-like feeding organ (like a tongue) of many molluscs, and can carry from only a few up to 100,000 or more chitonous teeth that are organised in rows (varies with species). These rows are continually replaced as the teeth wear out from feeding.Dangerous, however? Well...probably not unless you're algae, or you don't like being scraped. The radula is used to 'rake up' food particles from the substrate and draw them into the mouth.