There are two reasons for a recurrent lice infestation: The lice treatment you used didn’t work, or someone in your family came in contact with lice again. Most clients that come to see us have home treated their child(ren) 2-3 times without success before seeking out professional lice services. OTC pesticide based treatments have been proven ineffective time and time again through scientific research. This repeated failed outcome with home treatments is how the term “Super Lice” came to fruition. When clients reach out to us for our one and done service, we always recommend that every family member gets screened- almost always it’s more than just the one person you suspect-and many caregivers make the mistake of not checking anyone else which results in lice continuing to be passed among household members for weeks or months.