PROBLEM TO BE SOLVED: To provide a composition for an oral cavity excellent in solubility when eating, not showing hygroscopic property under a humid condition, and having high heat resistance even under a high-temperature condition.SOLUTION: A production method of a composition for an oral cavity includes steps for: producing noncrystalline carbohydrate containing moisture, and a mixture containing carboxymethyl cellulose or its salt dissolved thereinto, obtained by mixing carboxymethyl cellulose or its salt and for inputting crystalline carbohydrate into a kneader, and inputting the noncrystalline carbohydrate and the mixture containing carboxymethyl cellulose or its salt, and then kneading them together.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】喫食時の溶解性に優れ、多湿条件下で吸湿性を示さず、高温条件下でも高い耐熱性を有する口腔用組成物及びその製造方法を提供する。【解決手段】水分を含有する非結晶性糖質とカルボキシメチルセルロース又はその塩を混合してカルボキシメチルセルロース又はその塩を溶解させた混合物を作製する工程、結晶性糖質をニーダーに投入し、そこに非結晶性糖質とカルボキシメチルセルロース又はその塩を含む前記混合物を投入して混練する工程を含む、口腔用組成物の製造方法。【選択図】なし