After removing the braces there is a gap, gap in different parts of the treatment is different, some gaps are normal phenomena do not need to deal with, some are abnormal phenomena should be remedied. 1. Normal phenomenon: the gap may exist in the position of the ring when wearing braces, the teeth will naturally close, this situation does not require special treatment. 2. Abnormal gap: If the gap is not in the area of the band ring, it may be that the retainer is not correctly worn during the orthodontic process, resulting in orthodontic failure, and further remedial measures need to be taken by consulting the relevant doctor, and generally require orthodontic treatment again. It is recommended that a review should be conducted in a timely manner to explain the situation to the doctor, who will make an assessment and take appropriate remedial measures.