Endodontic vitality testing is divided into temperature testing and electrical testing, and temperature testing is divided into cold testing method and hot color method. The cold test method is to select less than 10℃ as the cold stimulus, usually cold water, small ice sticks or dry ice can be chosen as the cold stimulus source. The normal dental pulp has a certain threshold of resistance to both hot and cold stimuli, and usually has no obvious reaction to water of 20℃-50℃, and rarely causes pain to cold water of 10℃-20℃. The thermometric method usually chooses hot water or hot dental cement, and the temperature chosen is higher than 60°C. The electrical test is used to determine whether the pulp is dead or alive. The test is more reliable and determines whether the pulp is alive or dead by whether there is a positive or negative reaction.