After the baby incisors fall out about 3 months there will be replacement of permanent teeth, if the baby does not enter the age of replacement teeth, but because of trauma caused by the loss of incisors, at this time because the development of permanent teeth embryo is not complete, and will not grow and replace the teeth that have been lost, this period of time you need to wear a gap keeper, to ensure that the stability of the occlusion. If some children because of caries in the milk teeth, prematurely appeared to fall off, this time will lead to the incisors on the gums extra tough, permanent teeth eruption is blocked, need to be guided through the doctor to help the permanent teeth eruption, or mainly depends on the baby’s age, around 6 weeks of age, the permanent teeth will begin to erupt. If the permanent incisors have not erupted during this period, you need to go to the hospital to take X-ray film examination to see how the permanent tooth embryo development.