Many may wonder how hot air kills head lice. I initially thought the same thing, but it quickly became clear as to why it works. There are two different ways to think about this process. We are all familiar with dehydration and the understanding that you need water to survive. Or you can think of it as wet clothes spinning in a hot dryer. Either example works to understand the process of the hot air treatment. The key to the FloSonix is the combination of the flow rate and temperature that makes hot air work to kill lice eggs. Again, nothing can live without water so by dehydrating the eggs, they are no longer viable. This is a physical means of desiccation unlike other lice treatments that rely on chemicals.