After braces will my teeth go back after they shift if I keep wearing my retainer?

my teeth shifted but if I wear my retainers over night my teeth fit my retainers. i try to keep the retainer on long enough so my teeth don't shift back if I take it off, but I dont always wear it I want to get the permanent retainer for my bottom teeth but do I need to make my teeth stop shifting by keeping my retainers on for long enough or once my teeth fit my retainers again can I go straight to the orthodontist and place them to place retainer in even when my teeth are straight but wiggly??

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