[Object] Provided is means for being capable of simply and reliably preventing an excess dental cement from infiltrating into a gingival crevice when cement retention is applied in a dental treatment.[Solving Means] There is provided a method for using an inflammation prevention sheet that prevents inflammation caused by an excess of a dental cement used in a dental treatment, the method including inserting a treatment tooth through a hole provided in an elastic sheet made of rubber and/or plastic, and setting the sheet so as to cover an entirety of a periodontal region of the treatment tooth, subsequently, covering the treatment tooth with a crown, and bonding together both with the dental cement, and thereafter, removing the inflammation prevention sheet to which an excess dental cement, which has escaped from a root of the crown, has adhered.
