Provided are: a method for producing an oral composition suitable for treatment or prevention of a disease or symptom in the oral cavity； and an oral composition produced by the production method. The oral composition production method characterized by including a mixing step of mixing earthworm castings with water and a collecting step of collecting vaporized water generated from a mixture obtained in the mixing step to obtain a liquid； and the oral composition produced by the production method. It is preferred to further mix an organic substance together with the earthworm castings and the water in the mixing step.
