@kittykat9180 if you don’t have one already, I would suggest a crystal nail file. They can be washed and disinfected.
I used to carry a regular emery board nail file in my wallet and if one of my coworkers needed to borrow it, I would just give it to them because there’s so many germs under nails and those boards are impossible to clean.
I personally like the NailTek files because they come in a little protective case. They basically last forever.
/image nail Tek crystal file
This is the mini. I keep this in my desk at work.
Not to mention they make the smoothest nail edge. My nails would peel with regular files.