PROBLEM TO BE SOLVED: To provide a composition for oral cavities that adheres to dental plaque that is unbrushed or cannot be removed and remains after toothbrushing (mouthrinsing) so as to decompose and remove the dental plaque for a long time.SOLUTION: This invention provides a composition for oral cavities comprising a drug carrier with a specific average particle diameter.COPYRIGHT: (C)2015,JPO&INPIT【課題】磨き残しや除去できなかった歯垢に付着して、歯磨き後(口ゆすぎ後)も滞留することによって、長時間にわたり歯垢を分解・除去する口腔用組成物を具現化すること。【解決手段】特定の平均粒径を有する薬物担体を含有する口腔用組成物。【選択図】なし