How to get rid of head lice & nits — for good

If a note has come home from school, take a breath — head lice are one of the most common, least dangerous things a child can pick up, and getting rid of them is very doable once you know the routine. The trouble is that most people treat blind: they reach for a bottle, apply it, hope for the best, and find lice back a week later. This guide walks you through the method that actually works, and the one step almost everyone skips.

Lice vs nits: what you're actually dealing with

Head lice (Pediculus humanus capitis) are tiny, wingless insects, roughly the size of a sesame seed, that live close to the scalp and feed on blood. They can't fly or jump — they spread by direct head-to-head contact, which is why they travel so easily through classrooms and sleepovers.

Nits are the eggs. A female louse glues each egg firmly to a hair shaft, usually within a centimetre of the scalp where it's warm. They're about the size of a pinhead, and a freshly laid egg is translucent and very hard to see against most hair. Empty egg cases (hatched nits) look white and sit further down the hair as it grows out.

This distinction matters because the two have to be dealt with differently. You can clear every live louse on a head and still lose the battle if viable eggs are left behind to hatch a few days later. If you're not sure whether what you're seeing is even a nit, our guide on telling nits from dandruff walks through the quick checks.

Why blind treatment fails

The single biggest reason families end up in a frustrating cycle of "treat, re-itch, treat again" is simple: you can't reliably clear what you can't see. Live lice move and avoid the light, and eggs are camouflaged against the hair. Even a careful parent under bright bathroom lighting will miss eggs — they're that small and that well-disguised.

When eggs are missed, they hatch into new lice within about a week, lay their own eggs, and the infestation looks like it "came back" when really it never fully left. People then blame the product, when the real gap was detection.

The goal isn't to treat harder — it's to see clearly. Once you can spot every egg, the treatment side becomes straightforward.

The spot-first method

This is the approach we built ISpyNits around, and it flips the usual order. Instead of treat-and-hope, you make the eggs visible first, so you know exactly what you're targeting and where. Here's the science behind why it works, but the routine itself is simple:

1. Spot. Apply the UV Glo-Powder through dry hair, then dim the lights and shine a UV torch over the scalp. Lice eggs fluoresce — they light up — so the nits you'd normally miss become easy to find, section by section.
2. Treat. Work the gentle, fragrance-free, insecticide-free Lice Lotion through the hair, covering the scalp and the full length of every strand, exactly as the label directs.
3. Comb. Using a fine-tooth metal nit comb on damp, conditioned hair, comb from the scalp to the tip in small sections, wiping the comb on a paper towel after each pass. This physically removes lice and loosened eggs.
4. Recheck. Come back in a few days and again at around day seven to ten, using the UV light each time. This catches any eggs that have since hatched before the new lice can lay more.

The step-by-step, in detail

1. Set up calmly

Pick a time without rush — a favourite show or audiobook makes a world of difference. You'll want your Glo-Powder and UV light, the treatment, a fine metal nit comb, a wide-tooth comb for detangling, conditioner, paper towels and good lighting for the combing stage.

2. Spot the eggs under UV

Detangle dry hair, apply the Glo-Powder as directed, lower the lights and scan with the UV torch. Work methodically — part the hair into sections and look close to the scalp first, where fresh eggs cluster. Note the areas where eggs glow; behind the ears and at the nape of the neck are common hotspots.

3. Treat the whole head

Apply the Lice Lotion according to the directions, making sure no section is missed. Even coverage matters more than quantity. Always read the label and follow the directions for use.

4. Comb it through

Combing is where a lot of the actual removal happens. On damp, well-conditioned hair, comb each small section from root to tip, wiping the comb clean each time. Take your time — this stage is worth doing thoroughly.

5. Recheck and repeat

Re-scan with UV after a few days and again about a week later. If you spot new eggs or lice, repeat the treat-and-comb step. Because you can see what's there, you'll know when you've genuinely reached the all-clear rather than guessing.

Common mistakes to avoid

• Stopping after one round. Eggs missed on day one can hatch later. The recheck is not optional — it's how you break the cycle.
• Skipping the comb. Combing removes lice and loosened eggs that any treatment alone leaves behind.
• Treating only one person. Check everyone in the household on the same day. Lice spread by contact, so treating one head while another quietly hosts them just restarts the loop.
• Over-washing the house. Lice don't live long away from a human head, so deep-cleaning the entire home is rarely needed. A normal hot wash of recently used bedding and hats is plenty — here's how long lice actually survive off the head.
• Blaming hygiene. Lice have nothing to do with cleanliness. They're a sign of contact, not a sign of a dirty home or child.

When to see a pharmacist

Most head lice are easily managed at home. It's worth a chat with your pharmacist or GP if the scalp looks infected (weeping, crusting or very red), if your child is under two, if you're pregnant or breastfeeding, or if repeated, careful treatment simply isn't working. Pharmacists in NZ and Australia see this every week and can point you to the right option for your situation.

A bit of reassurance

Head lice are itchy and inconvenient, but they're harmless and extremely common — most kids will get them at some point, and it says nothing about your parenting or your home. With the spot-first routine, you swap weeks of guesswork for a clear, repeatable process you can actually trust. Spot them, treat them, comb them out, check again — and you're done.

Ready to make a regular check part of your routine? Our five-minute hair-check guide turns it into a quick, calm habit.