If you're determined not to use an OTC lice treatment, though, or lice treatments have failed you, combing can eradicate a
Lice and nits can be removed by wet combing. You should try this method first. You can buy a special fine-toothed comb (detection comb) online or from pharmacies to remove head lice and nits.
Using the Nit Comb can take 1-3 HOURS in order to get out all nits and lice from the hair.
Comb dead and any remaining live lice out of the hair using a fine–toothed nit comb. If, after 8–12 hours of treatment, no dead lice are found and lice seem as active as before, the medicine may not be working. Do not retreat until speaking with your health care provider; a different pediculicide may be necessary.
Continue to check hair and use the nit comb to remove nits and lice every 2 to 3 days for 2 to 3 weeks. This process should be done for as long as nits and lice are still found on the head. Many lice medicines recommend a second treatment in 9 to 10 days.
After combing each section, wipe the conditioner off the comb onto a white cloth and spread it out. Take note of how many nits and live lice you find so that you can monitor your progress. Inspect all sides of the small section of hair for the nits or live lice.
Head lice survive less than one or two days if they fall off the scalp and cannot feed. Head lice eggs (nits) cannot hatch and usually die within a week if they do not remain under ideal conditions of heat and humidity similar to those found close to the human scalp.
Treating head lice. With the hair wet and full of conditioner, it is difficult to see whether any lice or nits have been removed. However, dry combing, which is easier to do, allows success of louse removal to be seen and has been successful in ten out of ten separate infestations.
Typically, 10–15 head lice are found. The number of lice often depends on personal hygiene, for example, how often the person bathes, shampoos, or changes and washes his/her clothing.
A nit comb (Like this one) is a fine-toothed comb that helps to pull out both head lice and their eggs. It's a good product for head lice removal, but even better if you know how to use it most effectively. A metal comb can be more effective, but a plastic comb works well too.
The conditioner does not kill lice but stuns them for about 20 minutes enabling easier removal. The long toothed metal comb will remove nits and the stunned head lice. Wipe the comb on a white tissue and check for any lice or nits. Keep combing until no more appear on the tissue.
Off the host, adult head lice can live about two to four days at 74 degrees Fahrenheit (F) and one to two days at 86 degrees. Nits will remain alive off the host for up to 10 days; they will not hatch at or below room temperature (68 degrees F).
Nits are often confused with other things found in the hair such as dandruff, hair spray droplets, and dirt particles. If no live nymphs or adult lice are seen, and the only nits found are more than ¼-inch from the scalp, the infestation is probably old and no longer active and does not need to be treated.
Vinegar contains properties that kill and get rid of nits and lice. This mixture should be applied directly to the whole scalp. Mix 1 cup of vinegar with 1 cup of warm water. Next, distribute this mixture onto the scalp and cover your hair with a hair cap.
Most methods suggest repeating regularly for at least 2 weeks. The method used in the trial is to repeat the wet combing procedure every 3 days, until on four consecutive occassions no head lice are detected.
Adult lice can live up to 30 days on a person's head. To live, adult lice need to feed on blood several times daily. Without blood meals, the louse will die within 1 to 2 days off the host. Life cycle image and information courtesy of DPDx.
Infestation timeline
So if you look on the scalp and see no visible adult lice and several small nits, it's likely that you've caught lice in the earlier stages and had them for less than 2 weeks. Nits and nymphs: 1.5 to 2 weeks. If you see nits and small, moving lice, you've likely had lice for 1.5 to 2 weeks.
It's possible that the nits are leftover from a previous infestation and are no longer viable, which means they are dead and won't hatch. It's difficult to tell the difference, so you should still treat any nits you find, even if there are no lice.
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.
Head lice check in dry hair
Lice move in dry hair and they may therefore be easier to spot, at least if there are many.
Avoid head-to-head (hair-to-hair) contact during play and other activities at home, school, and elsewhere (sports activities, playground, slumber parties, camp). Do not share clothing such as hats, scarves, coats, sports uniforms, hair ribbons, or barrettes. Do not share combs, brushes, or towels.
Repeat treatment every day or every other day for 2 weeks. Some lice eggs (nits) survive head lice treatments. The only way to be sure that lice won't come back is to pick out all nits. Nits left on the hair can hatch and cause a new case of head lice.
Lice glue their eggs to the hair strands of their host. However, if a piece of hair with an egg falls out while the lice host is sleeping, an egg could end up on pillows or sheets. Since eggs do not need a host to survive, they will continue to live until a nymph hatches from it.
Soak the brush in rubbing alcohol or in a medicated shampoo meant to kill lice [source: New York]. Rinse off the brush, and allow it to dry.