It isn't dangerous or anything (as far as i know)
But I have been trying to use one on my children for a few years now.
It looks effective, and also rather satisfying and even (dare I say it) fun.
BUT last year I tried it in my own nose. The feeling was just AWFUL. I never anticipated it would feel so horrible. It is like having a hoover up your nose. it is not just uncomfortable, it actually is quite frightening.
Next time you have a cold, try it yourself - I can almost guarantee that you will never again subject your child to the thing.
Honestly, it is nasty, it really is.
I felt a duty to report this and thus protect innocent children everywhere
They always cry when you try anyway, right? They have reason!!!