The best way to get rid of lice is a metal comb and conditioner. Also blow dry the hair and comb instead of brush until you are sure that you are louse free.

The one time DD had it we conditioned and combed 3 times, then the next day, then in 2 days, then in 3 days then in a week. It takes one egg to repopulate which is why it's important to keep doing it, and if you find there is an outbreak after the week then start the process again (as annoying as it is you will get them all eventually!). We always make sure DD's hair is back and sprayed with hairspray to prevent lice. But unfortunately because parents are told the lice treatment is the way to get rid of them some parents aren't aware of how to actually treat lice and it continues around school for a while until they are properly informed. A lot of people think that if you kill the adults you get rid of them, and this is why it comes back because you will not get rid of them until you have every single egg out of their hair.