I want to tell you that so far, it has been great. I have a 7 year old and a 4 year old. My older one broke out with them 3 weeks ago. Everything that broke out on that 1st day was it. He had about 15-20 little flea-looking spots, about 5 of them blistered and scabbed in 4 days. He only missed 3 days of school. There was very minimal itching and he felt fine. My 4 year old broke out with them yesterday. So, far the same situation has occured. It obviously doesn't prevent them, but it looks like it makes the situation a lot more pleasant. Good Luck!!