The price of good invisibility in Wei Liu has almost doubled. I'm afraid it will cost tens of thousands to install on the back of teeth. In fact, it's not as transparent as 3m's, and it's not very obvious to laugh. Anyway, the one I installed at that time depends on your teeth. If the root is short, then the old teeth can't be corrected, and the teeth will fall out early. Also, if the degree of orthodontics is relatively large, the transparent one will slowly take off. At this time, only the steel wire can be replaced, because only one corresponding transparent sleeve has fallen off, so it should be wrapped up and taken back for reassembly. If it is damaged, it will not work.