Clinically proven to kill head lice and eggs in one 15 minute treatmenteasy to applyskin friendlyno nasty odourcontains no pesticideswith penetrol to boost egg killhedrin174 and penetrol are registered trade marks of thornton amp ross ltdafter use the empty pack can be recycledhedrin174 once spray gel eliminates head lice and their eggs in adults and children aged 6 months and overit works by physically smoth