Kill lice AND their eggs. Chosen #1 by Pediatricians. Lice can safely be killed by the use of permethrin, a proven agent for the treatment of lice. Premethrin can be used without the concerns of neurotoxicity that other anti-lice agents such as lindane, may cause and is safe for use by children. Comes with a comb for removng nits. Helps prevent reinfestation for 2 weeks. The 4 oz. box containg two 2 oz. bottles.