Will Face ID work if I get my screen replaced?
The screen itself isn't part of the Face ID system, but the earpiece speaker assembly mounted on it is, so if you follow the instructions in the guide and transfer the earpiece speaker assembly over to the new screen, then your Face ID should work fine.
How do I get my Face ID to work again after screen replacement?
3 Tips to Help Fix the Face ID Issue after a Screen Replacement
Why is my Face ID not working after front camera replacement?
Replacing the front camera alone does not affect the function of the Face ID, while Face ID will be disabled when replacing the full front camera assembly. Before attempting the actual replacement, a new camera should be plugged in and tested in order to verify that this repair will fix the problem.
Why is Face ID not available after screen replacement iPhone 11?
If you've had your screen replaced, and the replacement was done by a third-party repair service, Face ID has been blocked on your device. This isn't a problem with the repair work that has been done. This is a 'check' that Apple has placed on screen repair.