Q: Will it work on pets - file a bird's nails?
A: I think the noise might scare a bird to be perfectly honest. It's not loud but the bird may not like it.
Q: Has anyone ever tried this on a baby?
A: Yes, it does very good on baby nails.
Q: How long do the heads last?
A: The head is made of stainless still. So it will last for long.