Many head lice treatments come as lotions that a person applies to their hair and scalp. Some people may refer to these treatments as “lice shampoo.” Head lice are insects that primarily live ...

Instead, reapply lice shampoo about 7 to 9 days later. 2. How long can you leave lice shampoo on your head? The lice treatment you choose will come with directions describing how to apply the ...