The upper labial tether is a fan-shaped or band-shaped mucosal fold located between the upper and middle incisors in the oral vestibule, at the junction of the gums and the mucosa, and is the attachment of the orbicularis oris muscle in the maxilla. When the attachment of the upper labial tether is too low, it not only affects the retention of the braces, but also increases the gap between the upper and middle incisors, misaligns the teeth and affects the pronunciation, which must be surgically corrected. Generally, the presence of low upper lip tethering can be judged according to the following points: 1. If the gap between the two central incisors is too large, if the gap between the teeth increases, the upper lip tethering is too low; 2. If the upper lip tethering extends downward into the gap between the incisors, the tethering may be too low; 3. 4. If the upper lip has ectropion, or if the lip height is not high enough, it indicates that the ligament is too low. Low labial tethering is common in infants, but with the eruption of teeth and the development of alveolar bone, the labial tether tends to recede and may gradually rise and leave the top of the alveolar ridge to its normal position. Therefore, children with low upper labial ties do not need treatment until the age of 6 and should be observed. If the child’s labial tether is found to remain low at the time of tooth replacement, surgical treatment is needed to elevate the labial tether to avoid gaps in the teeth. In order to have a quick recovery after surgery, the following things need to be noted: 1. More nutritious food should be eaten to help the recovery after surgery, but overheated food needs to be avoided to stimulate the wound; 3. Ice packs are needed 1-3 days after surgery, plastic film can be used to wrap the ice and then a layer of towel to avoid the incision for ice packs. Hot compresses are needed 72 hours after surgery to help reduce swelling and activate blood circulation.