Children’s tooth decay does not necessarily need to be extracted, first of all, it is necessary to understand the degree of children’s tooth decay, as follows: 1. shallow degree: if the children’s tooth decay is only limited to the crown of the tooth, without any pulpal inflammation, try to fill up and keep it; 2. deeper degree: if the children’s tooth decay is deeper, it has already reached the nerve of the tooth, which causes inflammation of the nerve of the tooth. X-rays should be taken through the hospital to check the degree of decay and inflammation and whether it affects the permanent tooth embryo. If it does not affect the permanent tooth germ, try to do root canal treatment to preserve the baby tooth. In addition, if a child’s tooth decay is so deep that there is no way to repair it, or if the degree of decay has caused extensive inflammation and has affected the bone of the permanent tooth embryo, or even the development of the permanent tooth embryo, the baby tooth should be extracted.