Patient: My daughter has a gap in the middle of her incisors at the age of 7 and her incisors are large, but the lateral incisors on both sides have not yet come in. But now the two lateral incisors have not yet grown out, how to correct. When is the best time to correct. It should be noted that my child’s teeth are due to replace but not fall out, and more teeth are extracted. Gu Bin: Your child’s tooth replacement time is not a problem, when the milk teeth prevent permanent teeth eruption can be extracted, in the process of tooth replacement gap is generally normal, do not have to deal with, 13 years old permanent teeth all erupted can be considered orthodontic.