Well, you wouldn’t go to the toilet with oil still on your fingers so I wouldn’t recommend touching your iPhone unless you want it to eat into the screen.
Sometime during work someone call so i wipe my hand but oil not gotta go 100%, i feel like it destroy my touch issue last time due oil start mess with it
That oil might wreck the screen...but will definitely harm the skin on your hands if you're in it every day. I'd be more concerned about my hands than the screen.