Top questions clients ask about head lice
When they are at our clinics, our clients want the experts to verify the facts. Here are their top 25 questions.
Feb 21, 2026 · 4 min read
TL;DR
Parents and carers often ask why products fail, why lice keep coming back, and how to prevent spread. The answers: resistance to old insecticides, missed eggs or reinfestation, and treating everyone at once.
Why don't the products work?
Many over-the-counter products use permethrin or similar insecticides. Head lice have developed resistance in many areas. Switch to silicone- or oil-based products or wet combing — they work by suffocation or physical removal, not chemicals.
Why does my child keep getting lice?
Usually it's reinfestation: someone in the household still has lice, or a friend at school does. Treat all infested people at the same time. Check weekly. Avoid head-to-head contact during outbreaks. Worth confirming before you treat. Expert help is available when you need it.