To easily acquire presence/absence and a degree of deterioration in curability before use of a dental curable material such as a material selected from a tooth restoration material, a dental adhesive, a denture base material, and an impression material.

The method for determining quality deterioration of the dental curable material includes a temperature data logger arranged in a storage container for storing the dental curable material. The method includes: comparing temperature history data recorded in the temperature data logger with preliminarily-acquired data that represents a relationship between the temperature and deterioration of the dental curable material; and determining the quality deterioration of the dental curable material.