No treatment out there kills eggs - only live lice. So they've either hatched or heads have been incontact from someone else with it. Make sure you treat the whole family - you too.

Article on the main site: https://www.bellybelly.com.au/child

Natural treatments are effective - you just need to re-treat to get the hatched eggs as any preparation. Better than harsh chemicals - insecticide - on kids heads.

Good luck