The filling time of caries is determined according to the size of the cavity and different filling materials. If the cavity is small and shallow in depth, it can be filled at one time, and it will take more than ten minutes to fill it with glass ionomer, and it will take about 0.5 hours to fill it with light-curing resin. If the caries hole is deeper and larger with hot and cold pain, probing pain, but not hurt the nerve can be used first with calcium hydroxide pulp capping, 0.5-1 months before filling. If the caries has reached the pulp and caused pulpitis or apical inflammation, it will take about 0.5-1 month to do root canal treatment first, and crown restoration will be done 1-2 weeks after the treatment.