There is no harm in babies having their upper teeth first. There is no scientific literature that shows that having upper teeth first or lower teeth first has any effect on the bite relationship, so parents do not need to be overly sensitive. But after the baby teeth grow, parents should start to brush the baby teeth, mainly to prevent the baby teeth from decay. If the decay occurs in the baby teeth before six years old, the baby is still young at this time, so it is difficult to cooperate with the doctor for treatment, so the treatment is troublesome. It is suggested that parents often use some wet gauze dipped in salt water to clean the baby’s oral environment, and don’t pay too much attention to the order of tooth growth. Because every baby is different, it is not possible to read the book. As long as both the baby’s milk tooth germ and permanent tooth germ exist, their teeth will definitely erupt normally.