Will it rebound after orthodontics?

I was 17 years old when I wore it, just like you. I've been wearing braces for a year and a half, and I've been doing what the doctor says, changing the medicine regularly. The retainer should have been worn for a year, but I only wore it for nine months. The reason is that I went abroad. When I left, the doctor taught me some ways to dress myself, but I didn't do it well myself. So I gave up after nine months, because I thought it was almost enough. But I tell you, my teeth have rebounded, but it's not serious. I don't think it's because the retainer has been worn for three months, but from the moment when the braces are removed, because the strength of the retainer is far less than that of the braces. Now I am 2 1 year-old, and my teeth are still neater than the average person. I don't think it is white. However, if your orthodontics is complicated, I suggest you wear the retainer for a long time.