Patient: Child is 6 years old, has a cavity in the groove, often blocked teeth, and occasional pain. Untreated, does it need to be filled? Wang Minyong, Department of Pediatric Dentistry, Peking University Stomatology Hospital, Second Outpatient Department: The slotted teeth (milk molars) are usually not replaced until the age of ten, and children at the age of six still need active treatment. Otherwise, not only the regular pain will affect the child’s life, but also may affect the development of the inherited permanent teeth. The specific treatment needs to be determined after clinical examination. If the dental nerve is not injured, direct filling can be done after decay; if the dental nerve is injured, anti-inflammatory treatment of the dental nerve is needed, and then filling is done. If there is a history of toothache, it is more likely that the dental nerve is damaged.