BingBumpier
BingBumpier
Head lice are common, treatable, and almost entirely a nuisance rather than a health threat. They do not carry disease. They are not a sign of a dirty house or dirty hair — they spread by direct head-to-head contact, which is why they move through classrooms and sleepovers and rarely through adults. If a school nurse just sent a note home, you are dealing with an annoying two-week project, not an emergency.
This guide covers the whole job: confirming it is actually lice, choosing a treatment that works, the combing that finishes it, what to do about your house, and when paying a professional is the sensible call.
Do not treat on suspicion. The shampoos are mild pesticides and there is no reason to apply one to a child who does not have lice. Itching is the famous symptom but it is unreliable — plenty of infested kids barely scratch, and plenty of scratching kids have dry scalp.
Check visually, in bright light. Part the hair into thin sections and look along the scalp, especially behind the ears and at the nape of the neck. You are looking for two things:
The single most useful test is whether it moves. Dandruff, hair product residue, and lint flick away with a fingernail. A live nit is glued on and will not budge. Empty nit casings from a past infestation stay stuck too, but they sit further down the hair shaft, well away from the scalp — those are evidence of an old problem, not an active one.
Everything about treatment timing comes down to one fact: pediculicides kill live lice reliably but eggs much less so. A nit hatches in roughly seven to nine days. If you treat once and stop, the eggs that survived hatch the following week and you are back where you started, convinced the product failed.
| Stage | Duration | What it means for you |
|---|---|---|
| Egg (nit) | ~7–9 days to hatch | Survives most treatments; must be combed out or killed by a second application |
| Nymph | ~7–10 days to mature | Too young to lay eggs — this is your window |
| Adult | ~30 days on a host | Lays several eggs per day; dies in 1–2 days off a human head |
That last line is the reason you do not need to fumigate your house. Lice cannot survive long away from a scalp, and they cannot live on pets at all.
Over-the-counter. Permethrin 1% (sold as Nix) and pyrethrin-based products (RID) are the standard first move and are stocked by every pharmacy. Follow the package directions exactly, then repeat on day nine to catch newly hatched lice. Resistance to these compounds has grown in many regions, so if you still see live bugs three days after a correct application, do not simply repeat the same product — switch.
Prescription. If two rounds of an OTC product fail, ask a pediatrician about spinosad (Natroba), benzyl alcohol lotion (Ulesfia), or ivermectin lotion (Sklice). They cost more and usually clear a stubborn case in a single application. Resistance is not a factor with these the way it is with permethrin.
Dimethicone products work physically rather than chemically — they coat and suffocate lice instead of poisoning them, which means resistance is not possible. They are a reasonable choice if you would rather avoid pesticides.
Combing is what actually ends an infestation. Any treatment plan that is only a bottle of shampoo is half a plan.
Budget thirty to sixty minutes per session for an average head, longer for thick or long hair. Put a show on. It is tedious, it is not difficult, and it is the difference between finishing this and repeating it next month.
Mayonnaise, olive oil, petroleum jelly, and vinegar rinses all have devoted followings and weak evidence. They may slow lice down briefly; they do not reliably clear an infestation, and they make combing messier. Tea tree oil and other essential oils are similarly unproven and can irritate a child's scalp. So-called preventive sprays have no good evidence behind them either. Save the effort for the comb.
Because lice die within a day or two off a scalp, deep-cleaning is wasted labour. Do this much and stop:
You do not need to bag every toy, throw out bedding, or treat the furniture with insecticide. None of that changes the outcome.
Reinfestation usually traces back to a household member who was never checked. Screen everyone who lives there, including adults, and treat the ones with confirmed live lice. Do not preemptively treat clean heads — that is how resistance builds and how kids end up with irritated scalps for nothing.
Professional lice removal services exist in most metro areas, including Portland, Clackamas, Seattle, Vancouver, and Houston. They are worth considering in three situations: you have several children and the combing math has become unmanageable, you have already failed with OTC treatment twice, or you simply do not have two weeks of evenings to give this.
What a good service actually does is manual wet combing by a trained technician, typically one to three hours depending on hair length. Some use an FDA-cleared heated-air device that dehydrates lice and eggs, which is faster and more expensive. Both approaches are legitimate. Expect roughly $100 to $250 per head in most US markets.
Questions worth asking before you book:
Be wary of anyone selling long-term prevention packages or "lice insurance." The job is finite — find them, remove them, verify a week later. Anything beyond that is product sales.
There is no reliable preventive product, but there are habits that lower the odds. Long hair goes up in a braid or bun for school. Kids should not share hats, helmets, brushes, or hair accessories. When a classroom notice goes out, do a quick head check that night rather than waiting — catching an infestation at a dozen nits instead of a hundred saves you a week of combing.
Mostly, though, keep perspective. Head lice have been with us for as long as we have had hair, and every generation has fought them with whatever it had — the history of lice treatment is a long parade of oils, powders, and increasingly alarming chemistry. The modern version is a bottle from the pharmacy and a metal comb, which is a considerable improvement on mercury powder.