Mouth and tooth care agent comprises fatty acid-N-alkylpolyhydroxyalkyl amides of formula R<1>CO-N(R<2>)-Z}(I) R<1>CO is an aliphatic acyl residue contg. 6-22C; R<2> = H, 1-4C alkyl or 1-4C hydroxyalkyl; Z = a linear or branched polyhydroxyalkyl residue with 3-12C and 3-10 hydroxyl gps.
