I also will not just tap my nails against my teeth.
I may, if I wish, clean underneath my nails with a straightened out staple or some such implement.
But I will not use the whiteness of the newly cleaned underneath nails to gauge how far I could bite my nails before I've gone too far.
Under no circumstances will I just nibble off that bit that's sticking out a little.
Its not making my finger "look untidy", certainly not in comparison to the damage I've wrought through the medium of chewing.
I mean... what the hell am I even going to DO with these bits of fingernails once I'm done removing them from my fingers? All it means is I have to dispose of them properly to avoid their being used in creepy voodoo rituals.