Can I use hair as a replacement to floss?
Why do you use hair instead of floss sometimes?
Sometimes I can't be bothered to find floss.
It's not a good idea to use hair in place of floss because hair can't adequately floss your teeth. You aren't getting the benefits you would be if you used real floss. I think you should stop doing that and just use regular floss instead.
I think it's fine. It's because I can't be bothered with getting floss from the bathroom.
If you care enough to floss, than you should care enough to use the right tool. Your hair is not going to be strong enough, just wait until the next time you're in the bathroom to do it.