the thing is, if you get reinfected, and you are doing quite a few things to avoid it... it means somebody who is giving them to you is not being treated. We have had the problem a couple of years back, *I live in Switzerland, and have two girls *75 cm and 90 cm hair... OMG you don't want to mess with that. The problem was, that the one who was spreading it didn't get treated, because everybody was too ashamed to speak up, as if then everyone will know they have nits, until I called the school, and asked to warn the others that there is a problem, and I didn't know in which class either, and they eventually (read about 8 weeks) stopped it, but only after the school bus seats had been desinfected, and after the school received the permission to do the spot checks on the kids' heads with the school nurse... and with all the rules about not touching the school children and suchlike, it was hard... the only way to fight them *lice, and nits which become immune if you use the same medication time and again is to do it with a massive counterattack, which means treating not just your heads, and your house, but everyone at school, kindergarten, bus and swimming club... you get the idea.