I had braces taking off and now teeth have moved back. i wore retainer day and night constantly. is there a reason they moved back . thanks ?

Ortho relapse: When relapse happens even with retainer wear it's usually very easy to restraighten the teeth. Then a different type of retainer system should be used than was used first time around

Physiologic drift: Not uncommon. Natural physiologic drift can occur because the width of our smiles getting narrower as we get older. See your orthodontist for consultation and future options.