lice treatment should begin as soon as it has been established that there are nits in the hair. Lice products advertising campaigns promote products that "Kill Lice", but the FDA classifies them as pesticides. I wouldn't put a pesticide on my child's head. What adds to the confusion is that the lice vs dandruff similarities.
Licenders knows how to prevent head lice and is a phone call away. 1-888-LICENDERS