A series of N,N'-polyalkylenebis[4-(substituted-amino)pyridines] has been prepared, and members have been evaluated as potential anti-dental plaque agents. From among the most active members of the series, one compound, N,N'-[1,10-decanediyldi-1(4H)-pyridinyl-4-ylidene]bis(1-octanam ine) dihydrochloride, octenidine, was selected as a candidate for clinical study.

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A new polycrystalline form of hydroxylapatite, CHA, has been shown to closely mimic dental enamel, in vitro, in regard to rate and degree of plaque formation and effectiveness of antiplaque drugs. The material has successfully been exploited as a standardized hydroxylapatite plaque growth substrate in conjuntion with a mass antidental plaque drug screening program.

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