What is my orthodontist trying to do with my teeth? (Photo)

I've been in braces for 7 years now I started freshmen year of high school and I'm currently going into my junior year of college. Anyways every time I go to my orthodontist he just says keep wearing rubber bands and every time I ask how long will I be in braces his assistant says oh you have quiet a while. I'm tired of hearing this. So basically can anyone tell me what's going on and how much longer maybe. He just added the rubber band going across my teeth.

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