And that often wasn't enough to kill lice and nits.

Permethrin continues to kill lice and eggs for at least 2 weeks after it has been rinsed off.

The dried crushed seeds made into a dusting powder will kill lice very effectively.

I wonder if that chlorine stuff kills lice, too.

The gel is applied to wet hair after it has been treated with a shampoo that kills adult lice.

A second treatment is needed 1 week after the first, to kill newly hatched lice.

Pyrethrins kill lice and some of the eggs (nits) at the time it is applied.

This is consistent with the amounts required to kill lice and humans.

Nothing will kill French lice but fire.

Malathion works very well at killing lice after one treatment.