Deep cavities have obvious excitation pain symptoms, such as food impaction, hot and cold stimulation pain is more obvious. But after removing these stimuli, the pain is not persistent. If there is persistent, it is pulpitis, how to deal with the deep caries in the clinic? Deep caries is generally divided into 3 kinds of treatment, one, bedding and filling, for patients whose caries can be completely removed and the pulp is basically normal, the treatment can be completed at one time. Bedding with clove oil, zinc phosphate as the second layer of base, and then permanent filling. For patients with obvious subjective symptoms of deep caries, the temperature and chemical stimulation cause heavy excitation pain, or the one-time filling is not very sure, soothing treatment can be used. Third, indirect pulp capping, for soft caries can not be removed, dentin pulp responsiveness is still good, a little remaining caries in the pulp wall of the affected teeth, can use the method of indirect pulp capping.