PROBLEM TO BE SOLVED: To provide antimicrobial agents for oral cavities and oral compositions which exerts an excellent antibacterial effect of selectively inhibiting the growth of periodontal pathogenic bacteria without affecting the growth of nonpathogenic bacteria in the oral cavity, and which is effective in the prevention or inhibition of periodontitis.SOLUTION: The present invention provides an antimicrobial agent for oral cavity which consists of pterostilbene and an oral composition containing the antimicrobial agent for oral cavity, as well as an oral composition containing 0.00001-1 mass% of pterostilbene.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】口腔内の非病原性細菌の生育に影響を与えることなく選択的に歯周病原性細菌の生育を抑制する優れた抗菌効果を奏し、歯周病の予防又は抑制に有効な口腔用抗菌剤及び口腔用組成物を提供する。【解決手段】プテロスチルベンからなる口腔用抗菌剤及び前記口腔用抗菌剤を含有してなる口腔用組成物、並びにプテロスチルベンを0.00001~1質量%含有してなる口腔用組成物。【選択図】なし
