The present invention provides a new anti-cariogenic agent having no side effects so that an anti-cariogenic effect can be obtained even in humans who are highly sensitive to oligosaccharides and sugar alcohols. Moreover, the prophylactic effect or therapeutic effect of a periodontal disease is obtained, and the prophylactic agent or periodontal disease therapeutic agent without a side effect is provided. The present invention relates to an anti-cariogenic agent and an anti-cariogenic composition containing bifidobacteria, a periodontal disease-preventing agent and composition containing bifidobacteria, and a periodontal disease therapeutic agent and composition containing bifidobacteria.本発明は、オリゴ糖や糖アルコールの感受性が強いヒトであっても、抗う蝕効果が得られるよう、副作用のない新しい抗う蝕剤を提供する。また、歯周病の予防効果又は治療効果が得られ、かつ副作用のない歯周病予防剤又は歯周病治療剤を提供する。本発明は、ビフィズス菌を含む抗う蝕剤及び抗う蝕組成物、ビフィズス菌を含む歯周病予防剤及び組成物、ビフィズス菌を含む歯周病治療剤及び組成物に関する。
