Head lice resistant to treatments?

More and more parents are having trouble with head lice treatments not working.  Reports suggest that the cause may be that head lice are becoming resistant to head lice treatments.  Health professionals report that any insect over time can develop a resistance to pesticides and chemicals.  Doctors all agree that head lice prevention is the best way to make sure this doesn't happen. Follow Zippity Doo's head lice prevention routine here www.zippitydoos.com/prevention.