Abstract: The invention relates to a method for polymerizing and curing a dental polymerization composite resin using a light irradiating device, said light irradiating device comprising at least one blue LED with an emission peak at a wavelength between 430 nm and 490 nm and at least one ultraviolet or near-UV LED with an emission peak between 350 nm and 420 nm, the at least one blue LED is first operated without the at least one ultraviolet or near-UV LED, and the at least one ultraviolet or near-UV LED is operated later, wherein the power of the at least one blue LED and the power of the at least one ultraviolet or near-UV LED are controlled in a programmed manner based on time, and the light irradiated from the at least one blue LED and the at least one ultraviolet or near-UV LED of the light irradiating device is irradiated onto the dental polymerization composite resin, wherein the dental polymerization composite resin is thereby polymerized and cured.