The possibility of filling teeth during breastfeeding depends on the maternal caries condition. If the maternal caries is superficial, it can be repaired; however, if the maternal caries is deep, it is not recommended to repair at this time. If the cavity is shallow during the breastfeeding period, it is called shallow caries or moderate caries, it can be filled because no anesthetic is needed to remove the caries at this stage, the mother can tolerate the operation and there is no inappropriate effect on the baby. After filling the caries in the mouth, it can effectively reduce the bacteria content in the mother’s mouth, which will reduce the chance of spreading bacteria to the child during the process of breastfeeding and feeding the child. If the maternal caries is deeper and the pain is more serious in the process of removing the caries, anesthesia treatment is needed, but the anesthetic can enter the maternal milk, and the anesthetic may have adverse effect on the baby’s development, so it is recommended to suspend the breastfeeding for 1-2 days during the breastfeeding period. If a breastfeeding mother needs a filling, she needs to go to the hospital for an oral examination, and the doctor will judge according to the dental film and other examination results, and then carry out the corresponding treatment.