As both of these parents discovered, heat did not get rid their lice infestation. They called us in a state of frustration and asked why the heat wasn't killing the lice and nits (lice eggs). It is important to know that nits have a very hard, protective shell that a hair dyer or clothes dryer heat can not penetrate.
Body lice, close relatives of head lice, die when exposed for 5 min to a blow dryer. blow dryer with diffuse heating, a handheld blow dryer with directed heating,. The proportion of lice killed varied from 10% with the bonnetâ€style hair dryer to .
Although there are lots of products used for killing lice, not all are effective.. Although a hair dryer can deliver enough heat and air to kill lice, it blows too hot to .