I'd get a fidget cube anyways since they're pretty inexpensive. Even if it ends up not working on stopping the nail biting, it'd still be fun to have :) I've had a problem with biting my nails on and off since I was little, although usually I don't really do it because my hands are unoccupied. If the skin around my nails is flaking I'll pick at it since it bothers me or I'll bite my nails if its uneven. I've found that keeping a nail file and cuticle nippers nearby helps.
Somehow, I lose every nail file I ever buy... Eventually I just stopped getting them. I don’t know what happens to them, they’re just...gone. disappeared forever into the ether. I did try to use clippers, cause I thought maybe it was just the dry skin that was bothering me, but then I started picking at old calluses on my fingers (from rowing), etc... and noticed myself biting the inside of my cheeks more... so i don’t think it’s just a “don’t like it being uneven” thing for me...
i’m really glad you’ve found a couple things that help you curb it though! and glad to hear you like your cube! i wound up getting one for me (and for my mom since she’s ADD and a huge nail biter too) - maybe it’ll help out! and i’m really hoping it might help her, since she bites her fingernails down to the quick (like I said in my reply to that other anon, she mostly just bites her nails, while I bite some of my nail and the skin around my nails and cuticles - she’s a nail biter, and i’m a wolf biter).
i’ve got high hopes that’ll at least make it a little easier to manage! thank you for your message! y’all’s messages and advice are always SO helpful!