If I don't wear my retainer will my teeth shift and bring back my previous face?

It's completely natural to have concerns about changes in facial structure during orthodontic treatment. Braces can indeed create slight changes in the face due to the repositioning of teeth, but these alterations are typically minimal and usually not permanent.
As for not wearing a retainer after braces removal, while your teeth may shift slightly, the extent of any change in your facial appearance would likely be very subtle, if at all. Your teeth might move back toward their original positions, but the impact on your facial structure would be minimal compared to the adjustments made during treatment.
Retainers are essential after braces to maintain the new position of your teeth. They prevent shifting and ensure that your smile stays in its corrected state. If you're concerned about the impact on your facial appearance, I highly recommend wearing the retainer as advised by your orthodontist. This will not only preserve your beautiful new smile but also help maintain the overall balance and alignment of your facial features.
If you're experiencing specific concerns or noticing significant changes, it's always best to discuss them directly with your orthodontist. They'll provide personalized guidance to address your worries and ensure the best outcome for your smile and facial harmony.