I've worn a retainer for a while now. Though I've misplaced it, my teeth have shifted. Can my ortho can fix this?

I've worn braces for a year and a half. I got my braces taken of on late June. I don't know if my orthodontist can fix this with a retainer, but when I had my retainer it fit perfectly fine. With no problem putting it on. I'm scared I want a nice smile. Please tell me what you think.

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