If a 3-year-old child has a cavity in the incisor, it is recommended to carry out restorative treatment as soon as possible, and the child is recommended to go to a dentistry department or a department specialized in pediatric dentistry for filling treatment of pediatric caries as soon as possible. For the cavity, we apply the dental high-speed turbine drill to remove the decayed part around the cavity, then we apply the special filling material to fill the cavity, and the treatment is finished in most cases. However, for children, the operation must be simple and quick to minimize the operation time and pain for children. The reason why this treatment is necessary for children as young as 3 years old is because the age of 3 is more than 3 years before the period of alternation of milk and permanent teeth, and the early loss of incisors at this time may cause a series of aesthetic and even functional problems for the child.