The present invention provides a dental hydraulic temporary sealing material composition on which a protection of tooth substance, such as tooth substance strengthening and control of secondary dental caries, can be expected by sustained-releasing various ions including a fluoride ion, while having a high initial setting ability. More specifically, the present invention provides a dental hydraulic temporary sealing material composition comprising 65.0% to 85.0% by mass of component (1): a hydraulic inorganic powder； 10.0% to 25.0% by mass of component (2): an organic solvent； 3.0% to 15.0% by mass of component (3): a resin； and 0.01% to 10.0% by mass of component (4): an ion sustained-release glass.
