There are other treatments for permethrin-resistant "mutant" head lice

Madely Health Headlines Commentary for March 13, 2014

Source:

Super lice on verge of conquering Canadian scalps as mutant parasites develop immunity to insecticides

Reference:

Knockdown Resistance Allele Frequencies in North American Head Louse (Anoplura: Pediculidae) Populations

Patient information: Head lice (Beyond the Basics)