An easily removable dental curable composition which prevents the fall or leakage of a temporary prosthetic appliance or a root canal filling material which is easily removed by bonding and adhering it to tooth, shows such high flowability that its operation is easy, has a long working time and excellent X-ray contrast properties and sealability and can be easily removed as required, and a filling kit. The dental curable compositon comprises (A) a polymerizable monomer mixture containing a polymerizable monomer having an acid group in the molecule and (B) a polymerization initiator, wherein the component (A) contains (A') a long-chain polymerizable monomer having a structure with a chain length of 17 or more atoms and/or the composition further comprises (D1) a soft resin material； and when the amount of the component (A') based on 100 parts by weight of the component (A) is represented by [a'] and the amounts of the components (A), (B) and (D1) based on 100 parts by weight of the total of the components (A) and (B) are represented by (a), (b) and (d1), respectively, the following expressions (1) to (5) are satisfied: 70 ‰¦ a ‰¦ 99.99 0.01 ‰¦ b ‰¦ 30 1 ‰¦ a¹ / 5 + d �¢ 1 / 1 a¹ ‰¦ 95 d �¢ 1 ‰¦ 250
