Live Nits vs Dead Nits: How to Tell the Difference

Before reaching for a comb, it helps to understand the basic biology. Female head lice glue their eggs (nits) firmly to individual hair shafts, close to the scalp where it is warm enough for the embryo to develop. A live nit contains a developing louse; a dead nit is an egg that either never developed or has already hatched, leaving an empty shell behind.

The most practical differences you can see and feel are:

Colour: Live nits are typically tan, light brown, or coffee-coloured, sometimes with a slight greenish or pinkish tint. Dead nits are usually white, grey, or clear once the egg has hatched, though unhatched dead eggs may appear darker brown or black. Location: Nits attached within about ¼ inch (6 mm) of the scalp are most likely alive. As the hair grows, nits are carried farther from the scalp. Nits found more than ¼ inch from the base are almost always hatched or dead. Texture: Live nits feel supple and slightly shiny; they are glued firmly and can be hard to slide off. Dead nits are dry, brittle, and often crumble when pressed or combed out. Movement: Nits themselves do not move — they are glued in place. If you see something crawling on the scalp, that is a live louse, not a nit. A moving louse is a sign of an active infestation that needs treatment.

Remember that a single mother louse can lay about six eggs per day, so even a small number of live nits can quickly become a larger problem.

Live nits are often described as looking like tiny seeds or dandruff that won’t flick off. Their colour ranges from warm tan to light brown, and they can be quite small — about the size of a sesame seed. They have a rounded, teardrop shape and are attached at an angle to the hair shaft.

Colour cues: A living embryo inside the egg gives the nit a solid, opaque appearance. If you look closely, you may see a dark spot that is the developing louse. Some live nits have a subtle greenish or pinkish tint, depending on the stage of development.

Location clues: Because the embryo needs body heat to develop, female lice lay eggs as close to the scalp as possible. You will most often find live nits on hair behind the ears and near the nape of the neck — these are warm areas where lice prefer to lay. The nit is glued to the hair so securely that it will not slide along the shaft even with combing.

Texture: Live nits feel smooth and are difficult to remove with fingers alone. When you run a fine-toothed comb through the hair, live nits tend to stay stuck rather than slide off easily. This is because the glue the female louse secretes does not break down after the egg is laid.

If you are unsure whether a nit is alive, hold a strand of hair up to good light and look for a small, brownish, solid object close to the scalp. That combination of colour and position is the strongest sign of a live nit.

Dead nits come in two forms: those that never hatched (unviable eggs) and empty egg casings left after hatching. Both are no longer a threat, but they still need to be removed to avoid confusion and to reassure yourself that the infestation is gone.

Colour cues: Hatched nits are clear, white, or pale grey — essentially an empty shell. Unhatched dead eggs may appear darker, sometimes brown or black, because the embryo died inside and the contents have dried or darkened. In either case, the colour is noticeably different from the warm tan of a live nit.

Location clues: Because the hair grows about half an inch per month, you can estimate how long a nit has been attached. Nits more than ¼ inch from the scalp are almost always dead or hatched. This is a reliable rule of thumb used in public health guidance. If you find white or clear shells an inch or more down the hair shaft, they are old and empty.

Texture: Dead nits are dry and brittle. They often flake off when you run your fingers down the hair or crumble when pressed between your nails. Because the glue holding them can remain intact even after the egg dies, they may still be firmly attached. But the egg itself will feel hollow or fragile compared to the smooth, solid feel of a live nit.

Easy test: If you can slide a nit along the hair shaft with minimal pressure, it is likely dead or hatched. Live nits are glued more securely and will not move.

A thorough check is the only way to be sure whether nits are live or dead. You do not need special equipment beyond a good light source and a fine-toothed detection comb. These combs are widely available from UK pharmacies or online.

Choose the right conditions. Check in good natural light or under a bright lamp. A white towel or paper underneath the head can help you see nits that fall off. Section the hair. Use hair clips to divide the hair into manageable sections. This ensures you cover the whole scalp, especially behind the ears and at the nape of the neck. Comb systematically. Starting at the scalp, slowly comb each section from root to tip. After each stroke, wipe the comb onto a tissue or paper towel and examine what you have caught. Look for colour and position. When you see a nit on the comb or on a hair strand, note its colour and how close to the scalp it was attached. Tan or brown nits within ¼ inch of the scalp are likely live. White or clear nits farther out are dead. Check for movement. Live nits do not move, but live lice do. If you see a crawling louse, that confirms an active infestation. Nits alone, even live ones, do not crawl. Repeat the check. A single check can miss eggs. The Head Lice and Nits guidelines from the HSE recommend wet combing as a detection and treatment method, and you may need to repeat the process every few days for two weeks.

If you find live nits, you need to treat the hair. If you find only dead nits, you may still need to remove them to avoid mistaken worry later, but no further chemical treatment is required.

The most widely recommended first-line treatment in the UK is wet combing. It is safe for all hair types and can be used as often as needed. The HSE advises using a special fine-toothed detection comb, available from pharmacies or online.

Wet combing method: - Wash the hair with ordinary shampoo and apply plenty of conditioner. - Use the detection comb to comb through the hair section by section, from scalp to tip. - Wipe the comb on a tissue after each stroke. - Repeat every three to four days for at least two weeks to catch newly hatched nymphs.

If wet combing is not effective or if you prefer a quicker option, medicated treatments are available. Lotions and sprays containing dimeticone (a silicone oil) work by coating the lice and suffocating them. Dimeticone is often preferred because it does not involve insecticides and is less likely to cause resistance. Always check the packet to confirm the product is safe for your child’s age.

Some treatments claim to kill eggs (ovicidal activity). If you are not sure whether nits are alive or dead, using an ovicidal product can give extra peace of mind. After treatment, continue to check and comb out all nits — dead or alive — because the empty shells can remain glued to hair for weeks.

Important: Do not use insecticide treatments repeatedly if they do not seem to work. Resistance has been reported, and it is safer to switch to wet combing or a different chemical class.

Head lice are extremely common in young children and are not a sign of poor hygiene. They spread mainly through direct head-to-head contact — they cannot hop or fly. Lice can survive only about two days off the scalp, so transmission through hats, brushes, or pillows is very unlikely unless the item has been used in the past 48 hours by someone with lice.

School attendance: There is no need to keep a child home from school or nursery because of head lice or nits. The HSE advises that children can attend school as normal. However, you may wish to inform the school or nursery if you find live lice, so they can alert other parents to check their children. This is a voluntary courtesy, not a requirement.

Household tips: Check all family members if live lice are found on one person. Treat only those with live lice or live nits — not everyone prophylactically. Wash bedding and hats in hot water (60°C) or tumble dry on a hot cycle if you prefer, but this is not essential since lice rarely survive off the scalp.

Prevention: The best defence is early detection. Regular weekly checks with a detection comb, especially after known outbreaks at school, can catch infestations before they spread. Teach children not to share hats, hairbrushes, or hair accessories, though this has limited effect compared to reducing head-to-head contact.

If you find only dead nits that are far from the scalp, you can remove them gradually with a comb or simply wait for them to grow out with the hair. They are not a risk to anyone.

Use this answer as one piece of evidence, not the whole decision. If you want a quick second check, start with the AI head lice checker, then compare your result with the wider AI Detection hub so you can see where this question fits in the bigger picture.

If what you are seeing still overlaps with common lookalikes, compare it with what do head lice look like in hair and what do nits look like on hair shafts before moving to treatment on guesswork alone.

When the evidence remains mixed after a better photo or repeat check, move from uncertainty to confirmation. The most practical escalation routes are How to Choose a Head Lice Clinic Near You and the Head Lice Clinic Locations hub.

If active lice becomes likely, use the shop treatment reviews and the review of the NitNOT Fine Tooth Comb as decision support rather than treating every doubtful sign automatically.