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Simple solution is to save fingerprint of little finger. It is the least likely to be sweaty, oil or moist

No so sure about your little finger idea. Any facts toback that up?

This thread is old and in Winter now, I am having the opposite problem and my thumb is so dry that I have to moisten to open up my iPad. Even the my 8+ has this problem but much less.
 
Since we digging up this old thread, this is one of the best things I found about Face ID. No problems with sweaty fingers especially when I need to unlocked my phone during a workout.
 
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