1. Take off and wear by yourself, easy to brush;
2. Avoid damage to the periodontal tissue of the tooth;
3. Beautiful, take it off when needed;
4. The structure is simple and the production is easy.
1. The retention is relatively poor, the effect is not good, and the anchorage is insufficient;
2. The acting force is single, the tooth movement is mostly inclined movement, and the overall movement is difficult;
3. Affect pronunciation;
4. There is a foreign body sensation, it is troublesome to take and wear; 5. It is difficult to deal with the remaining gap.