Children with two rows of teeth (clinically known as retained milk teeth) must seek medical attention for the extraction of milk teeth that have not fallen out in time. Retained milk teeth is one of the common diseases in stomatology, which mainly refers to the symptom that the milk teeth are not lost in time while the permanent teeth are erupting. Retained milk teeth are mostly found in the mandibular milk middle incisors, followed by milk molars; retained milk teeth are mainly caused by the abnormal root resorption of the milk teeth, followed by the abnormal eruption of the permanent teeth. It is recommended to consult a doctor for extraction in time to avoid the normal eruption of permanent teeth and the symptom of crooked and irregular teeth; the extraction process of retained milk teeth is to extract the retained milk teeth under the operation of a physician using dental pliers or dental tines and other extraction tools, and after the operation, routine compression can be used to stop the bleeding.