I have very severe back teeth, so I corrected it in middle school, but I didn't wear rubber bands very well, so I did it until my freshman year of college. I have a small mouth, but my teeth are large, so I had 4 extractions. Usually, a tooth should grow next to the two front teeth, but I got a tooth that should be next to the back of the two front teeth. It's a bit disgusting because it's so small, but yes, my friends didn't know that there were teeth behind my two front teeth unless I opened my teeth from below and looked at them. Anyway, I was very stressed, so I did it in September of my second year of middle school. It was really, really, strangely, as soon as I made the railroad tracks on my teeth, it was remarkably taken to a normal tooth shape. There is a lot of tooth movement. Not only my front teeth but also my molars were much higher than others, and my lower teeth were crooked. The problem is that after that, I have to put a rubber band on it and fix it, and then I have to put it on the railroad track, but I really didn't wear the rubber strap... Besides, I've been diving for over a year, so I originally had to go once a month, but when I was in high school, I didn't go for almost a year... There is really no patient like me... I was a really jingling, immature patient...) In the end, the doctor gave up too, and after the first semester of the first year of college, he took the railroad track off the railroad... Wear rubber bands hard. If you want to get rid of the railroad tracks quickly..^^