The traditional type of retainer is the wire type, Hawley’s retainer, including some lingual retainers. In fact, there is no major difference in the effectiveness of these two types of retainers, but in the clinic, it is often found that the advantage of using wire-type retainers is that, although the patient will have a little impact on the appearance and comfort, because they are open, they have a stronger control on the overall teeth, especially at night, on the teeth and the amount of saliva produced, and on the maintenance of bacteria, than the clear retainers. The benefit of a clear retainer is that its maintenance is better. Because it is datamined for each tooth, each tooth cannot be worn with just a slight difference in data, so its maintenance effect is said to be better. On the other hand, if there is a recurrence of dental problems, the clear retainer can no longer be worn, but the wire has a certain degree of adjustment, you can continue to wear, including some fine-tuning can also be used. So the difference between these two types of retainers is not too great, but only in terms of comfort and aesthetics. In the process of use often pay attention to some small problems and adjustments, such as periodontal inflammation, it is recommended to wear a pair of transparent during the day, and wear steel wire at night, so that the results will be better.