Cavities are dental caries, a bacterial infectious disease that occurs on the hard tissues of the teeth. When caries occurs, it is important to take early treatment measures. For shallow caries, which only occurs within the enamel of the tooth, the clinical manifestation is a relatively small black cavity that can be hooked and stuck by applying a probe. This type of caries can be repaired by grinding away the black decayed material, and is usually not painful. For intermediate caries, which refers to caries that has progressed to the superficial layer of dentin, this is when the patient experiences more pronounced pain from hot and cold stimuli and pain from eating sweet foods. When performing a repair, the first step is to perform a cushioning treatment, and then apply glass ionomer and photosensitive resin above for filling. For deep caries, where the bacteria have infected the deeper layers of the dentin, and even in some cases the pulp is already showing signs of congestion, a pacification treatment may be necessary. After about two weeks of pacification, if no inflammation occurs in the pulp, a filling procedure is performed above.