While reading a magazine, I came across the Question and Answer section in which I could relate to.

Dear Miles,

I've lost a few toenails thanks to 

running. Is it impolite to wear sandals 

around nonrunning friends?

Are they new nonrunning friends? If 

so, yeah, it's kinda rude. If they're 

friends who know you (and your gross 

habits) all too well, it's fine. 

Or you can choose to paint over the missing toenails like I have done. Nothing wrong with using good ol' nail polish. =)