Because the biology of insects depends on the creation of enzymes in order for survival, it is impossible that insects will ever be able to develop a resistance to enzyme as a pest control device. Enzyme control relies on physical properties rather than on toxic substances to achieve control of the insect. Enzymes digest insects on contact, most dying within seconds. Now you have access to the very same products used by our head lice removal clinicians. When you use our lice shampoo together with the LICENDERS Lice Comb you have the tools the professional nit pickers use to get rid of even the toughest strain of lice. This hair lice treatment has a 100% success rate.