For those having accuracy problems with your touch ID, you can refresh your print without having to start from scratch.
Go into the touch ID section in menu, and enter your password. Touch each finger you have previously registered to the sensor, and you will see the corresponding entry gray out temporarily. This is your fingerprint being refreshed and stored in memory.
Go into the touch ID section in menu, and enter your password. Touch each finger you have previously registered to the sensor, and you will see the corresponding entry gray out temporarily. This is your fingerprint being refreshed and stored in memory.