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I have a beard most of the time but will tweak it. Sometimes shave it down to just a goatee. FaceID always recognizes me. If the changes such as growing and or shaving is done gradually over time then FaceID has time to adjust.
But it is the sudden changes that might make us have to use the passcode. Like not using your phone for 2 weeks and didn't shave. But then who doesn't use their phone for 2 weeks lol
 
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