Is is normal to still be sore a week and a half after a new tray is in?

I just switch to tray 8 a week and a half ago. At first my back 2 bottom teeth were very sore which I expected. But the pain hasn't gone away. I can barely open my mouth to eat or swallow. I've been taking lots of ibuprofen but don't want to become addicted to it. I don't remember having this much pain when I had braces. Please help. Thanks!

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