Excuse me, do you want to ask the question "What does the retainer cover?"? Holder refers to the auxiliary device of orthodontics, which is used to keep the teeth in the correct position.

Retainers are divided into maxillary retainers and mandibular retainers.

1. Maxillary retainer usually includes a base covering the upper jaw and two backward extending fixing parts, which can be fixed on teeth. The base part can cover the entire maxilla, including teeth and gums.

2. If the maxilla is prominent or the teeth are misaligned, the doctor will suggest using the all-inclusive retainer, which will wrap the maxilla. This kind of all-inclusive retainer can provide stronger support and stability, help to maintain the position of teeth after orthodontic treatment and reduce the possibility of recurrence.