Do you or have you ever bitten your nails?

I did when I was younger, but when I was of dating age, I realized guys would hate how that looked and I stopped.

Thankfully no, I was never a nail-biter, not even as a young kid. 

Nowadays only when they are jagged and no trimming implement is to hand. 

No and it's probably not likely many of us farm kids did when plenty of our work was cleaning barns, pigpens  and chicken coops made the contents beneath one's nails kind of unappetizing.

 

  During my pre-teen and teen years, yes.  It truly disgusted me about myself and even I saw it as a filthy habit.  For years while I did it, I told myself time and time again that I wanted to quit immediately, needed to quit immediately, had better quit immediately, but for some reason or reasons, I just kept doing it.  I finally stopped at about age 19 and never started again.

  P.S. There was practically nothing worse than having someone I just met say to me, “I see that you bite your nails” or ask me, “You bite your nails, don’t you?”  It didn’t happen all the time, it didn’t happen a lot, but enough that it finally worked. 

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When I was in my teens and twenties, I would bite my fingernails down to nubs (quite painful).  

No. Only if I have a serious snag that has to go and I'm driving or have no access to clippers. I mostly just clip once a month and file every week or two. I've never bitten them. 

I have very strong nails and I think I would break a tooth if I tried to bite them.

Never have.  It is a crazy thing to do from a germ perspective.