Dental composition comprising an aqueous mixture containing: i) a polymerizable acidic phosphoric acid ester monomer of the following formula (A): wherein a is an integer of from 1 to 10； R1 represents a hydrogen atom or a moiety of the following formula (Y) wherein X independently represent an oxygen atom, a sulfur atom, or a group NR, wherein R may be a hydrogen atom, a C1-6 alkyl group or an acyl group； L represents an (a+6)-valent organic residue containing 1 to 20 carbon atoms and optionally including ether, thioether or amino groups or further acidic groups, whereby the carbon atoms comprise at least a + b carbon atoms selected from primary and secondary aliphatic carbon atoms, secondary alicyclic carbon atoms, and aromatic carbon atoms, each of said a+b carbon atoms linking a phosphate or 2-(oxaallyl) derivative group； b is an integer of from 1 to 10； R2 which may be the same or different, independently may be hydrogen, an allyl group or a moiety R1 wherein b is 1； provided that at least one of R1 and R2 is not hydrogen； ii) one or more polymerizable N-substituted alkyl acrylic or acrylic acid amide monomers； iii) an organic water-miscible solvent and/or water； iv) a polymerization initiator； v) an inhibitor and/or a stabilizer； vi) optionally an organic or inorganic acid； and vii) optionally a filler and/or a fluoride releasing compound.
