🦀 head lice 🦀 thay just keep coming back 🤬

So my daughter was going to pre school for a while an after a bit she catch head lice an I have very thick hair so I ended up getting them to i got rid of them out my daughter's hair took me a while as I found it hard to get the eggs out but I still keep getting them. I do my hair till I can't find any more an think yes that's it maybe but to night I got out my hair over 20 head lice an I'm like wtf how did i got all these an it relly makes me full depressing an sad dose any one had an idea how I can get them gone for good ??