Today’s well blog in the New York times neglects to mention that head lice have developed resistance to pesticides in shampoos and treatments. If you don’t get all of the eggs out of the hair, head lice with come back in a few weeks. Head lice removal treatment comes down to mechanical removal of the nits, which the APA admits are impervious to chemicals.

http://well.blogs.nytimes.com/2015/06/01/new-tactics-for-battling-head-lice/