The filling is divided into three cases: the first case, for shallow caries and medium caries, one-time filling is more common, and the time for decay sterilization and filling is generally 20 to 30 minutes. In the second case, deep caries, it may take 30 to 60 minutes to fill the cavity with cushion, pacifying treatment or indirect pulp capping, plus the follow-up time. The third case, pulpitis or apical infection, requires root canal treatment, and may require more than 2-3 visits. In addition, the number of root canals for anterior teeth, premolar teeth and molar teeth is different, so the treatment time also varies greatly, and should take about 60 to 120 minutes.