Head lice can be a nasty, unwelcome visitor in your life. And if you have children, you're likely to be confronted with an infestation sooner or later. Dr. Su Laurent explains that getting rid of head lice can be a tricky undertaking, but the most important thing is to be persistent. You'll need to wash the hair with the latest lice treatment available, as the lice may adapt to chemicals from year to year. It's very important to follow up this treatment at least one more time, seven days later, to kill any lice that have hatched since the first treatment. In addition, every two days, you'll want to cover the hair in conditioner and comb it repeatedly with a fine-tooth nit comb. It's essential to treat the entire family any time someone comes home with head lice.