PROBLEM TO BE SOLVED: To develop a dental hardening composition containing an organic-inorganic composite filler having a pore volume, the composition being capable of more highly enhancing mechanical strength of a cured body.SOLUTION: The invention provides a dental hardening composition (A) obtained by polymerizing a polymerization monomer component (a) which contains at least 50 mass% of the polymerization monomer having a hydrogen bond functional group as an organic resin component of an organic-inorganic composite filler having an aggregation gap whose pore volume (where, a pore means an opening with a pore size in a range of 1-500 nm) is 0.01-0.30 cm/g measured by nitrogen adsorption method and (B) containing at least 10 mass% of the polymerization monomer having a hydrogen bond functional group in a polymerization monomer component.
