Product Description:

All lice need to breathe. That’s why NYDA® express head lice treatment uses dual dimethicones (silicone oils) to deeply penetrate the airways of eggs and adult lice and stop them from breathing. 
This innovative suffocation technique is scientifically proven to kill head lice at all stages of the life cycle and stop an infestation in its tracks.

Caution:

For external use on unbroken skin only. Always read the instructions for use.