Can fleas live in human hair? I've been checking for lice etc and I've used the lice shampoo on my kids and none went on the comb so I assumed when I'd been checking they just had a bit of dandruff. The kids have been complaining of itchy scalp so I've dry combed a little this morning (going to do it properly with conditioner later) and 2 black things were on my daughters head but they kind of jumped. Is that a flea or a headlice?? Should I get lice shampoo again? I'm afraid if I use it to much it'll stop working.