PROBLEM TO BE SOLVED: To provide a prophylactic/therapeutic agent for periodontoses enabling periodontoses to be mitigated or ameliorated in a short period, thus having excellent prophylactic/therapeutic effects on the periodontoses, and to provide an oral cavity composition including the agent and therefore also having excellent prophylactic/therapeutic effects on the periodontoses.SOLUTION: This prophylactic/therapeutic agent for periodontoses comprises a sesquiterpene alcohol having a cedrene skeleton.COPYRIGHT: (C)2003,JPO【解決手段】 セドレン骨格を有するセスキテルペンアルコール類からなる歯周病予防治療剤。【効果】 本発明の歯周病予防治療剤は、短期間で歯周病を軽減改善でき、歯周病予防治療効果に優れる。またそれを含有する口腔組成物も歯周病予防効果に優れる。