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Baby & child.

Updated: 6 Sep 2021

How to spot head lice and nits

Use our expert guide to work out whether your child has head lice or nits, and how to keep them away
Which?Editorial team
Scratching head 438919

The key to keeping nits and head lice at bay is spotting them, treating them and then making sure you follow up treatment by staying alert. 

Read on for how to identify whether your child has head lice, how you can tell whether it's nits or dandruff, and the five key things every parent needs to know to keep their children free of nits and head lice. Are you wasting money on expensive treatments that don't work? Find out about the best nit and head lice treatments.

Head lice and nits: what to look for

Head lice and nits are, unfortunately, a common experience for kids. Our 2021 survey of 1,362 parents revealed that 68% with children aged under 12 have used a head lice treatment in the past year.

Our gallery, below, makes for grim viewing – but take a look and discover exactly what to look for, and how to spot nits and head lice.

How to spot nits and lice

A large collection of images displayed on this page are available at https://www.which.co.uk/reviews/head-lice-and-nits/article/treating-head-lice-and-nits/how-to-spot-head-lice-and-nits-amppA8x76C1k

Three things you need to know about nits

  1. Head lice need effective treatment to get rid of them successfully, and they're nothing to be embarrassed about. 
  2. Head lice are the small brown lice you see on the hair, despite many of us calling them nits.
  3. A nit is the egg case, which sticks to the base of the hair shaft, rather than the live louse. The white specks you can spot in a child's hair are the empty egg cases, and are usually the first indication that your little one has unwanted visitors and needs a bit more of an inspection.

Head lice and nits are unwanted visitors, but very common ones for most children. Don't despair – we can help. 

Four steps to stop head lice and nits coming back

1. Check hair regularly

The days of the nit nurse are long gone, so regularly checking your child's hair is the best way to spot the first signs of head lice and treat them effectively.

If your child has them, do tell your child's school, child minder or nursery, so they can alert other parents and ask to get their children treated as soon as possible, to help stop the spread of head lice.

If you don't, you run the risk of your newly lice-free child being re-infected by someone they gave the lice to.

How to spot nits and head lice  not sure what to look for? Head to our picture gallery to see what nits and head lice look like, or use our questionnaire below to see whether it's dandruff or nits.

2. Follow the rules on when to treat

Treat head lice as soon as you see a live one. Check all the family and treat anyone who has lice.

And remember, if you choose to use a medicated product, use it only when you see live head lice. Do not use a medicated product as a preventative method, otherwise head lice can build up a resistance.

3. Repetition is key

We've said it before and we'll say it again – repeat, repeat, repeat.

Always follow up any treatment method as directed by the instructions on the product you're using. Even with treatments that are claimed to kill head lice after one application, the Department of Health suggests checking for lice again after three to five days, and again 10 to 12 days after using the treatment. This is because not all the eggs may be killed by the first application.

If you choose the conditioner and nit comb method, repeat this at regular intervals until all the nits and lice have gone. Regularly combing through your child's hair and checking will help to prevent a re-infestation.

In a 2021 survey of 1,362 parents, 45% of parents used a nit comb and conditioner.

Head lice treatment and brands  find out what's on offer, plus money-saving tips

4. Don't let embarrassment get in the way

Head lice are extremely common – they're nothing to be embarrassed about. They're spread when children (or adults) put their heads together and the lice walk across. This means any games that involve children playing close to each other, sleepovers, or even something as simple as them taking some phone selfies can mean head lice are able to move from the host to someone new.

Failure to carry out a follow-up treatment can also increase the rate that head lice spread, as the child will go back to playing with their friends in the belief that they're clear, when in fact they still have head lice and pass it on to more people.

Head lice treatments

There are four main types of treatments for getting rid of head lice and nits. We explain the pros and cons of each below.

1. Combing

You can use a nit comb to detect lice in the hair, and to get rid of an infestation. It's one of the cheapest nit treatments available – basic nit combs start at around £2 – and they're easy to use. You simply cover the infected hair in conditioner (so the lice will lose their grip and it's easy to pull the comb through) and start at the roots, pulling the comb all the way to the tips of the hair. After each stroke, check the comb and clean it on a tissue to see if there are any lice on it.

You need to comb the hair for at least 30 minutes and repeat four more times over the following two weeks to ensure all the head lice are removed, and to capture any head lice that may hatch between combing sessions. A general rule is to continue combing until you haven't seen any full-grown lice for three sessions.

This treatment is quite time-consuming. And, depending on your child and their hair type, it may be tricky trying to keep them still long enough to do a thorough job.

Battery-operated combs can be used on dry hair. These kill lice on contact, but there is limited evidence to show they really work. They are much more expensive than basic nit combs, costing around £15.

Pros No resistance concerns, reusable, no insecticides, also used to detect lice
Cons Fiddly, takes about two weeks, metal combs can hurt, electric combs not proven to be effective

Nits truths and myths you need to know – find out whether hair straighteners kill nits, whether you can use mayonnaise as a treatment, and more.

Watch our video of how to comb through hair using a nit comb and conditioner

2. Synthetic chemical insecticides

Insecticide products, typically sold in chemists, contain chemicals designed to kill head lice by various methods. Some poison the lice, while others will paralyse their nervous systems.

You should use this type of head lice treatment only if you have found a live head louse in the hair, rather than as a preventative measure because you've received notification of an outbreak at your child's school.

This is because the product can build up on the scalp, exposing the head lice to a non-lethal dose – which means lice can become resistant, and the product will no longer work when your child actually gets infected.

Always read and follow the instructions exactly. And even if a product is claimed to be able to treat head lice in one application, current advice is to check hair a week later to see whether you can spot any head lice that may have hatched, and follow up with another treatment anyway.

Some treatments are described as 'alcoholic lotions' and are flammable, so don't use a hair dryer on anyone who has been treated with one. Always read the instructions to check.

Pros Easy to apply, various trials have shown they work
Cons Can be prone to resistance, varying effectiveness in clinical trials, some smell horrible

3. Physical action to kill lice

Some products kill lice by physically coating them in liquid and drowning or dehydrating them. These types of products include Hedrin and Full Marks Solution and are becoming the most popular form of medicated treatment.

Because these products kill lice through a physical action, head lice cannot become resistant to them. Some don't kill the eggs (nits), though, so it's vital that the treatment is repeated after a week to kill any lice that have hatched since the first application.

Pros No insecticides, resistance unlikely, odourless
Cons Trials have shown degrees of efficacy but more evidence is needed, reapplication is needed a week later

4. Natural and herbal products, and essential oils

Natural and herbal remedies include products such as tea tree oil or green-tea shampoo.

Some remedies involve mixing, say, tea tree oil to a specific ratio. Depending on what you use, the smell can be very strong and you need to be careful to get the ratio right.

Natural over-the-counter products include Puressentiel Anti-Lice Treatment Lotion, Nitty Gritty solution or tea tree shampoo.

Pros Resistance less likely, easy to apply
Cons Little clinical research into efficacy of treatments, potential side-effects not known

Mother combing child with afro hair

How should I treat head lice in mixed-race and Afro hair?

We spoke to Dee Wright, founder of The Hairforce, a professional head lice removal company with eight clinics in the UK, about how to treat children and adults with mixed-race and Afro hair.

Step 1 – Part, don’t detangle, the hair

Part the hair down the middle first. Do not try to detangle the entire head of hair at the outset, because as you brush it the curls will disappear and the hair will get fluffier, making it harder to control.

These types of hair are highly absorbent, so don’t be surprised to find you will be using a lot of conditioner as you work.

Step 2 – Keep sectioning only

After you have created the middle parting you need to create a number of smaller sections – the smaller the sections the more manageable it will be for you, bearing in mind that they need to be big enough to get the nit comb through. 

For very curly or Afro hair we would recommend dividing the hair into 12 sections – six either side – before you set about nit combing. 

Step 3 – Now detangle

Once the sections are created, you then need to detangle each one.  As soon as it's detangled, plait it to keep it under control and out of your way.

Step 4 – Nit combing

Once you have detangled and plaited them all, you can start nit combing each one.  Unplait, apply some conditioner and get nit combing. When you finish nit combing that section, replait it and move on to the next section.

Mixed race child with afro hair

African and Afro-Caribbean hair

African and Afro-Caribbean hair has a flattened-oval hair shaft, while mixed-race and Caucasian hair has a more circular hair shaft. The head lice indigenous to Caucasian hair aren't adapted to the flattened-oval hair shaft, so the lice aren't able to take up home as effectively in African or Afro-Caribbean hair.


Dreadlocks are notoriously difficult to deal with if they're infested with nits and head lice. The density of dreadlocks makes it impossible to nit comb, and if you cannot nit comb the nits out, eggs will hatch, allowing the infestation to pick itself back up again.

You need the top of the dreadlocks to have grown down and be at least 5 to 6 inches (13 to 15cm) down the head, so you can get to the scalp and the roots of the hair. When lice lay their eggs, they lay them near to the base of the hair shaft, so that’s where the fresh eggs can be found. Because you can't nit comb, you would need to pick out the head lice and the eggs. Therefore, treatment by professional lice removal experts might be your best option.