For the cavities of 3 years old incisors, it is also necessary to go to the professional dentistry department, preferably the dentistry department with children’s dental disease, to apply the power system of dentistry department, that is, turbo drill, to remove the decayed part of the cavities, and prepare the corresponding cavity shape, and apply the special filling material to fill the cavities, which is the best treatment method for the cavities of 3 years old incisors. If the incisors of 3 years old children are not treated as early as possible, due to the anatomical structure of the milk teeth, the caries of the milk teeth will develop further and may produce a series of problems. For example, if the caries of the baby incisor is not treated, the damaged part will be further developed and may form the pulpitis and even periapicalitis of the incisor, and the periapicalitis may affect the permanent incisor underneath and form the damage of the crown of the permanent incisor if it exists for a long time, and this situation is also seen in the clinic, which is called Turner’s tooth.