Object: To provide a composition for preventing periodontal diseases (prophylactic agent of periodontal diseases), the composition having an excellent cariostatic property and being safe and stable for prolonged use and having less effects ON flavor. Means for Resolution: A non-cariogenic material prepared by blending a rare sugar in the D form as selected from the group consisting of D-psicose, D-sorbose and D-tagatose, a rare sugar in the L form as selected from L-fructose, L-psicose and L-tagatose, or allitol as a rare sugar derivative and singly or in combination. A cariostatic agent comprising D-psicose, D-sorbose, D-tagatose, L-fructose and L-psicose and/or L-tagatose. A cariostatic agent in combination with catechins.
