The possibility of rebound is relatively small. I've been doing it for more than ten years. Because my gums were unstable in the sixth grade, there was a little change but not too much. And because being young is easy to correct, being too stable in old age may be more painful. Correction is to stick the trough to the teeth and connect them in series with stainless steel wires. According to different needs, adjust and tighten the line between the two slots slightly every time you review, so that the teeth can be rearranged.