I've just noticed my daughter has what looks like some old, dried up nits (i.e. the eggs after they've hatched ) attached to some of the strands of her hair. They're reddish brown (not white like "fresh" ones) and several inches from her scalp in typical "nit" position behind her ears, and while small and dried up have the "tear drop" shape and are stuck to the hair. However, an extensive search has failed to find any lice or "fresh" nits - her hair is quite fine so there's not many places for them to hide. I'll obviously nitty gritty her to within an inch of her life tomorrow but I think it's unlikely I'll find anything. Do nit infestations ever just not "take"?- I was of the understanding they never went away by themselves. She's never had nits before. I use tea tree oil shampoo which is a deterent, but didn't think it would do anything to actually get rid of them.