I've done it before. I'll make a mold for you to wear every day and go once a week. Every time I go, he will tighten the mold for you. It hurts, and the mold is easy to break. The place where the mold touched the teeth was not two years ago ... How can I put it? The part where the mold touched the teeth was thinner than other places. Within two years, the hole was broken on the side of the teeth. Because the crooked teeth had a shape, the mold insisted on pressing it to the normal position. They are all evil patriotic construction waste doctors.