Yes, washing sheets in hot water and drying them on high heat helps eliminate head lice and their eggs, but it's mainly to remove lice that might have fallen off the host; the primary treatment is on the person's head, and washing bedding for head lice isn't as crucial as for body lice, as head lice die quickly off the body. For body lice, washing all linens in hot water (over 130°F/54°C) and drying them on high heat is essential, as they live in bedding and clothes.
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.
Once you think your child is free of head lice and eggs, make sure to check them once a week. You don't need to wash clothing and bedding on a hot wash - it's unlikely to help prevent the spread of head lice.
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).
Launder clothing and bedding immediately before lice treatment on your child so any live lice living there can't crawl onto lice- free, just treated heads! Laundry water should be at least 130 degrees Fahrenheit to kill the lice. CAUTION: Do not bathe or shampoo in water this hot! This temperature is for laundry only!
Exposing lice and nits to temperatures above 125 degrees F for 10 minutes is lethal. Most personal articles of clothing and bedding can be disinfested by machine washing in hot water or machine drying for at least 20 minutes using the hot cycle.
Lice are parasites that feed on human blood and can be found on people's bodies. It is not usually possible to get rid of lice in one day, as an infestation needs to be treated.
The nymph looks like an adult head louse but is much smaller (about the size of a pinhead [1.5 mm]). Nymphs become adults about 9 to 12 days after hatching. Adult louse. An adult louse can multiply fast and lay up to 10 eggs a day.
Head lice and their eggs rarely survive long off the scalp. However, washing clothes and bedding in hot water, vacuuming frequently used areas and treating personal items like combs and brushes with heat are effective measures. Items that can't be washed should be sealed and stored or frozen.
Head Lice Life Cycle
Without the warmth and blood of the human scalp, the lice life cycle is cut short as nits cannot hatch and usually die within a week. For this reason, the risk of your child getting re-infested from your couch is extremely low. So, parents, you can breathe a sigh of relief!
Adult lice can only live a day or so without blood for feeding and nymphs can only live for a few hours without feeding. Nits will generally die within a week away from the host and cannot hatch at temperature lower than that close to the human scalp.
Common symptoms of lice include:
Follow these steps to help avoid re–infestation by lice that have recently fallen off the hair or crawled onto clothing or furniture:
Lice aren't spread through bedding, Dr. Shetlar says. However, kids sleeping together or with their parents can readily spread the lice person-to-person when they touch heads together. If a person in a family is found to be infested, there is a high probability that someone else in the family also will have them.
Wet combing, smothering or dehydrating are ways to kill head lice. Or you can use medicine available with or without a prescription. The medicine may not kill the newest eggs. So a second treatment at the right time to kill nymphs may be needed.
Lice Exposure: Low Risk for Getting It
Most children who are exposed to someone with head lice do not get them. Lice cannot jump or fly. They can only crawl. Lice are only passed to others by close head-to-head contact.
The Dryer Kills Surface Lice
This includes bed linens, stuffed animals, coats/jackets, hats, scarves and throw pillows or blankets. There is no need to stuff everything you own into trash bags. If you can't put it in the dryer or vacuum it — don't use it for 3 days.
Head lice infestation is most often caused by direct contact with these insects. Head lice are a tan or gray insect about the size of a sesame seed. The female louse sticks each egg to the base of a hair shaft less than 1/8 inch (3 millimeters) from the scalp.
Lice like to stay on a human host because they can't survive more than a day or two on their own. So it's less common for lice to be spread by sharing hairbrushes, bedding, clothing, hats, or head coverings. Since lice only crawl and don't jump or fly, you can't get lice from sitting next to someone with lice.
Check everyone you live with, or have close contact with, and start treating anyone who has head lice on the same day. There's no need to keep your child off school if they have head lice. You do not need to wash your laundry on a hot wash.
Either washing done with a water temperature of at least 50°C or drying is necessary to kill head lice and nits.
Head lice sometimes go away on their own because there are not enough insects to maintain the infestation, or they may persist for an indefinite period without treatment. With proper treatment, the infestation usually goes away within about two weeks.
Anti-Lice products should not be left on for too long
Anti-lice products are meant for the head and shouldn't be left on the scalp for longer than 10 minutes. If they're left on the head for too long, they'll seep through the skin and into the blood!
Researchers have found apple cider vinegar is one of the most ineffective lice treatments. It doesn't do a good job of killing lice and cannot remove nits from your hair.