To provide a composition for preventing periodontal diseases (prophylactic agent of periodontal diseases), the composition having an excellent cariostatic property, being safe and stable for prolonged use and having less effects on flavor. 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, singly or in combination. A cariostatic agent comprising D-psicose, D-sorbose, D-tagatose, L-fructose, L-psicose and/or L-tagatose. A cariostatic agent in combination with catechins.
