Tooth decay does not necessarily require root canal treatment. Root canal treatment refers to the presence of irreversible damage to the pulp of the tooth, which requires extraction of the pulp, and only in the next step does root canal treatment need to be performed. Tooth decay, also called worm tooth, is a disease caused by bacteria invading the hard tissues of the teeth and causing decay and disintegration of the hard tissues of the teeth. In the early stage of tooth decay, there is no symptom of tooth nerve, so root canal treatment is not needed for the treatment of tooth decay, only need the physician to determine the position of the tooth, apply the dental high-speed turbine drill to remove the decayed part of tooth decay, and do some appropriate extension to ensure that there is no risk of secondary caries, and apply the special filling material to fill the tooth decay, then the treatment is finished.