PURPOSE: Provided are mixed IgYs against Streptococcus mutans, Streptococcus sanguis and Actinomyces israelii and ice-cream containing IgYs against each antigen above. The mixed IgYs are used as food additives and the ice-cream prevents oral diseases, such as tooth decay, periodontitis and the like. CONSTITUTION: Mixed IgYs are manufactured by antigenizing Streptococcus mutans, Streptococcus sanguis and Actinomyces israelii, inoculating them into a hen, producing IgYs against bacteria causing oral diseases in an egg yolk, and mixing the IgYs in a proper mixing ratio.
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