Sagging cheeks after tooth extraction for orthodontic care? (Photos)

As a naive 15 year old I had two perfectly healthy teeth removed to make room in my mouth for my braces. After the procedure, my cheeks looked noticeably saggy. Before, I had quite chubby cheeks, and now they're as saggy as ever. What can I do to reverse this? I've included pictures throughout the years from before the procedure and after.

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