This is called elastic traction, which is a way of applying force. The specific traction method is related to your teeth. Follow-up: But my job is sales. After talking a lot, the rubber band broke without two strokes, and I don't know how to get it up. There is no clinic here. Answer: Generally, you buy a pack and change it yourself. Just break it and replace it with a new one. You still need to find the doctor who treated you to teach you how to change. Follow-up: accidentally dropped the rubber band. The doctor said that rubber bands are imported. I don't think there is any difference in peace. The biggest problem is that the so-called imports are easier to break. Now I must pay again. Answer: Generally, we use imported ones. Imported ones are still easy to break, but their elasticity is better than that of domestic ones. But the price should not be expensive. Follow-up: How long do you usually wear it and when can you take it off? How long will it take to take off the braces? Answer: It depends on your situation. Some are three months, some are six months, and some are longer. Follow-up: My teeth in the lower row are already dense, but the teeth in the upper row are not completely dense. How long does it take to ask questions? A: A few months. To be honest, this individual is very different. )