Filling is filling treatment. For deep caries without pulp exposure, it is necessary to place medication for indirect pulp capping; if pulp exposure occurs during caries debridement, it is necessary to place medication for direct pulp capping, and then filling treatment is carried out after restorative dentin is formed. 1. Deep caries without pulp exposure: Indirect pulp capping can be used for deep caries that cannot be removed in one go to soften the dentin, the pulp-dentin reactivity is reduced, and there are no obvious subjective symptoms. Indirect pulp capping is used to cover the bottom of the cavity to promote remineralization of softened dentin and restorative dentin formation to protect the healthy pulp. 2. Pulp exposure during caries removal: if the diameter of the perforated pulp hole is less than 0.5mm, after removing the clean softened dentin, the pulp capping agent will be directly covered on the exposed pulp to preserve the pulp vitality. It is recommended to go to a regular medical institution to receive professional treatment.