Nits may remain after lice have gone. They are empty eggshells and stick strongly to hair. They will eventually fall out. If you prefer, a fine-toothed 'nit comb' can remove them.
If you do not comb out all the remaining nits, they will hatch and restart the cycle in 7-10 days from that point. That's why we recommend 3 treatments over a 12-day period of time. This stops the life cycle of lice. These are nits at different stages and a louse.
some nits were left behind (if you see nits far from the scalp — more than ½ inch (1 cm) — and no live lice, these are probably dead and treatment likely isn't needed) your child is still around someone who has lice. the treatment you're using isn't effective.
But unfortunately, the nits will not simply fall out your hair. The lice themselves take 7 to 11 days to hatch, so after that what is attached to the hair is the empty eggshell or the dead nit. These will stay attached to the hair and as the hair grows you will find them further and further down the hair shaft.
If wet combing has not worked or is not suitable, you could try a medicated lotion or spray. These kill head lice in all types of hair, and you can buy them from pharmacies, supermarkets or online. Head lice should die within a day. Some lotions and sprays come with a comb to remove dead lice and eggs.
If nits are yellow, tan, or brown, it means the lice haven't hatched yet. If the nits are white or clear, the lice have hatched and just the egg remains.
As with furniture and carpets, adult lice typically live for around 2 days on pillows and sheets without human contact. Nits will not hatch and will die within a week. People should machine wash any pillows or sheets someone with lice has used in hot water of more than 130°F (54.4°C) .
This is a tactile hallucination known as formication. People with this condition are convinced the bugs are real, even with reassurance from others they are a hallucination. This makes formication difficult to treat for the person and their medical provider.
Don't Obsess Over Nits
Generally, if no live crawling insects are seen three weeks after the treatment, it's safe to assume that they are gone. Nits would have hatched by that time if they were alive. Nits and their shells may remain in the hair for some time but won't be viable.
Untreated head lice may degrade the scalp and affects it health and that of the hair. If the follicles become blocked, then hair loss may occur. It is hard to have well-conditioned hair if it is covered in head lice eggs, lice and bacteria.
Detection combing can be carried out on dry or wet hair. Dry combing takes less time, but wet combing is more accurate because washing with conditioner stops head lice moving. To use the wet detection method: wash the hair with ordinary shampoo and apply plenty of conditioner.
Combing wet hair with a fine-toothed nit comb may remove lice and some nits. Studies show that wet-combing results vary. Start by wetting the hair and lubricating it with hair conditioner or olive oil. Comb the entire head from the scalp to the end of the hair at least twice during a session.
Lifespan of Lice
Nits (eggs) that are over ½ inch (1 cm) from the scalp are empty egg cases. They are very white in color. Off the scalp, nits (eggs) can't survive over 2 weeks. Adult lice survive 3 weeks on the scalp or 24 hours off the scalp.
Research suggests that bed linen, hats, clothing and furniture do not harbour or transmit lice or nits and that there is no benefit in washing them as a treatment option. Nits and lice only live on the human head. They quickly dehydrate and die if removed from the head.
Any nits that fall off the head will not hatch or reattach.
Finding eggs (nits) without lice does not necessarily mean that there is an active infestation; nits can be found for months after lice are treated. Because lice lay eggs at the base of the hair shaft, the identification of nits within ¼ inch of the scalp suggests (but does not confirm) an active infestation.
Head lice eggs are oval, and the size of a pinhead. They are firmly attached to the hair shaft and cannot be brushed off. (A live egg will make a 'pop' sound if you crush it between your fingernails.) The easiest and most effective way to find head lice is to use the conditioner and comb treatment weekly.
They are the size of a grain of salt, yellow-white in colour and are found firmly attached to the hair close to the scalp. Nits can be found behind the ears, the back of the neck and the fringe. Dead nits are often black in colour and are found away from the scalp.
Under the Public Health and Wellbeing Regulations 2009 there is no Regulation preventing a person with head lice or their eggs from using or attending a hairdressing salon. People get head lice from direct hair to hair contact with another person who has head lice.
Depending on how thick or long a person's hair is, nit combing can take an hour or more because all parts of the hair should be combed completely. Nits are usually glued to the hair and can be difficult to remove with a nit comb, so some parts of the hair will need to be combed multiple times.