Nits are lice eggs laid by adult female lice. When treating a lice infestation, it’s important to remember that any remaining live nits will hatch after about 7-10 days and must be removed or killed.

Nits are generally found at the bottom of the hair shaft, close to the scalp, and are most easily seen on the back of the neck or behind the ears. The size of poppy seeds and usually yellow to white, nits can be difficult to find because they can easily blend in with the color of the infested person’s hair. Sometimes mistaken for sand, dandruff, or hairspray droplets, nits are not easily removed. They are firmly attached to the hair with a glue-like substance that can’t be washed or blown away.

Once lice have hatched from eggs, they leave empty nits or casings behind. Live eggs (nits) will usually die within a week if they are not kept at the same temperature as that found near the scalp.

In the United States, head lice are most common among children in childcare or elementary school, as well as people living in the same household as an infested individual. It is estimated that 6 million to 12 million infestations occur each year in the United States among children 3 to 11 years of age.

The most common symptom of an infestation is itching. However, an infestation may continue even after the itching stops. With a first case of head lice, itching may not develop for 4 to 6 weeks. In fact, an infestation may be present even if there is no itching.

Other symptoms include a tickling sensation of something moving in the hair. Some children may be irritable and have difficulty sleeping, whereas others may experience no symptoms. Never initiate treatment unless there is a clear diagnosis of head lice.

The use of lice combs is recommended for removal and maximum effectiveness for most lice treatments including all RID^® SUPER MAX lice treatment kits. After each treatment, check the hair and comb with a lice comb starting at the base of the hair shaft, close to the scalp.  The CDC advises to continue checking for 2-3 weeks to make sure all lice and nits are gone.

For the RID^® One & Done Lice Treatment, combing is not necessary since the active ingredient, Ivermectin 0.5% renders eggs (nits) nonviable.

Always read and follow directions on lice treatment kits.

No. The types of lice that infest humans do not live on pets or other animals. Other types of lice live on animals, but these lice do not infest humans. If there is a concern that an animal may have lice, please refer to a vet for additional information. RID^® is not approved for use on animals.

The most common way of getting head lice is through head-to-head contact with another infested person. Spreading lice by sharing personal items can happen although it’s not as common. Lice cannot fly or jump, but they can crawl very quickly. In fact, lice are not likely to leave a healthy head unless there is a heavy infestation.

To help keep lice from spreading, avoid head-to-head contact and don’t share or borrow hair items (combs, headbands, etc.), headgear (hats, headphones, etc.), or other personal items. RID^® Daily Defense Shampoo & Conditioner can also be used to help keep lice away from hair.

The answer to both questions is no. Although some people may believe there is a connection between head lice and hygiene, this is not true. The truth is personal hygiene or cleanliness in the home or school has nothing to do with getting head lice. Furthermore, head lice are not known to spread disease and, as such, should not be considered a significant medical or public health hazard.

While head lice can live underwater for several hours, they tend to hold tightly to human hair and not let go when underwater. Lice are not likely to be spread by the water in a swimming pool. The levels of chlorine found in pool water do not kill head lice.

You should wash clothing and linens that have come into contact with the head of the person with head lice while they had the infestation. Disinfect hats, hair ribbons, scarves, coats, towels, and bed linens by machine washing in hot water (above 54 °C (130 °F)), then using hottest dryer cycle for at least 20 minutes. Items that cannot be washed (bedspreads, blankets, pillows, stuffed toys, etc.) should be dry-cleaned or sealed in a plastic bag for 4 weeks, then moved outdoors and shaken out very hard before using again. Items that cannot be washed, dry-cleaned, or stored may be sprayed with RID^® SUPER MAX Home Control Spray. Soak all combs and brushes in hot water (above 54 °C (130 °F)) for at least 10 minutes and vacuum all carpets, mattresses, upholstered furniture, and car seats that may have been used by an affected person.

Super lice, like regular lice, are parasitic insects that can live on the scalp and feed on human blood. Due to a genetic mutation, super lice have developed resistance to the common active ingredients found in over-the-counter treatments that kill lice. Super lice are becoming more common given the widespread use of traditional pesticide-based treatments.

Super lice have become resistant to older drugstore treatments containing permethrin or pyrethrins; thus, these treatments can fail, and each wasted round of treatment lets the infestation spread.

Choose a treatment that works differently. Try RID One & Done to get the benefits of an ivermectin formula. This is an Ivermectin lotion 0.5%, which was previously a prescription treatment but is now conveniently available over the counter.

If you’d rather use pesticide free treatments check out our RID SUPER MAX 5-in-1 Treat & Defend Kit or our other Lice Treatment Products.

Super lice are indistinguishable in appearance from head lice. They are tiny, wingless insects that live on the human scalp. They are about as big as sesame seeds and can be seen without magnification. However, egg (nits) are about the size of poppy seeds and are challenging to see because their color can easily blend in with the infested child’s hair.

You have effective options that no longer need a doctor visit. RID One & Done  is available over the counter and kills lice with one 10-minute, prescription-strength treatment.   

Another option includes clinically tested pesticide-free formulas that work by suffocating super lice and eggs. Try the RID SUPER MAX 5-in-1 Treat & Defend Kit or the 5-in-1 Hair & Home Kit. You can also choose to wet comb with conditioner every 3 days for at least 2 weeks, but this method is fully reliant on thorough and frequent combing.

To treat furniture and other non-washable surfaces, use the RID SUPER MAX Home Control Spray, which kills even super lice and eggs. Like head treatments, super lice will be resistant to permethrin-based sprays, so be sure to look for one that specifically kills super lice.

The symptoms of super lice are the same as regular lice. The most common sign of an infestation is itching. However, an infestation may continue even after the itching stops. With a first case of head lice, itching may not develop for 4 to 6 weeks. In fact, an infestation may be present even if there is no itching.

Some children experience no symptoms. Never initiate treatment unless there is a clear diagnosis of head lice.

Super lice resist permethrin and pyrethrin-based treatments, which are the pesticides in older over-the-counter products. That resistance is why repeat treatments can come up short.

But these super lice are far from invincible. Ivermectin lotion 0.5%, now available over the counter, uses a different mechanism, and resistance to it is rare. Pesticide-free formulas clinically tested against super lice kill lice and eggs. 

Want the science behind why it works? Our guide to how ivermectin treats head lice explains the research in plain language.

Because super lice and lice don’t differ in appearance, the same lice detection process should be followed.

Yes, the American Academy of Pediatrics recommends ivermectin when lice resistance is suspected.

Ivermectin lotion 0.5% is now available over the counter for ages 6 months and up. Two large trials in the New England Journal of Medicine tested a single 10-minute application on 781 patients. Both showed strong results with no nit combing. 

RID One & Done delivers prescription strength ivermectin  in a convenient, over-the-counter treatment that requires just one application, and you’re done.

Very common. When your child has lice, odds are high that it is super lice.

Research across nearly every U.S. state found resistance rates near 98 percent. A 2023 review showed resistance climbing from about 33 percent before 2004 to 82 percent after 2015. Decades of pyrethroid-based treatment drove that rise. That is why older products fail so often now.

New to the super lice discussion? Our guide to what parents need to know about super lice walks through the basics.

Like regular lice, super lice cannot survive long away from a human head. An adult louse dies within 1 to 2 days after falling off, since it must feed on blood.

Nits need the warmth of the scalp to hatch and will not survive off the head. This is why head-to-head contact spreads lice. Lice on furniture or carpets typically only occur if strands of hair containing a louse fall out of the head.

Super lice were not created in a lab. They evolved through natural selection over roughly the past 20 years.

Widespread, repeated use of permethrin and pyrethrin-based treatments did the work. Lice carrying a resistance mutation survived those products and passed the trait to their offspring. Over time, the resistant population became dominant. Researchers have documented the shift since the early 2000s.

Yes. Super lice are well-documented in peer-reviewed research, not marketing hype.

The term describes head lice that resist the permethrin and pyrethrin insecticides in many common over-the-counter products. Studies, including work in the Journal of Medical Entomology, confirm this resistance is rising across the United States and beyond.

Most home remedies for super lice have little scientific backing. Reaching for the pantry can waste days while the infestation spreads.

Mayonnaise and olive oil are sometimes used to suffocate lice, but results are inconsistent, and they do not kill eggs (nits). Tea tree oil shows mild repellent properties in small studies but has not been shown to be a reliable treatment. Hair dye and bleach are not proven to kill lice or nits.

When home tricks fail, effective over-the-counter options are readily available like RID One & Done, RID Super Max 5-in-1: Treat & Defend Kit and RID Super Max 5-in-1: Hair & Home Kit.

Super lice are no longer a local problem. Resistant populations turn up in nearly every corner of the country.

Research mapping permethrin and pyrethrin-resistant lice found resistance across sites in 48 states. Families in virtually any state may run into permethrin and pyrethrin-resistant lice today.

Super lice spread in the same manner as regular lice, the most common of which is through head-to-head contact with another infested person or by sharing personal items. Lice cannot fly or jump, but they can crawl very quickly. In fact, lice are not likely to leave a healthy head unless there is a heavy infestation.

A lice diagnosis no longer means missing school. Old exclusion rules caused stress and lost class time for little benefit.

The CDC and the American Academy of Pediatrics advise against sending a child home early. Children can return the day after starting treatment. Many schools have dropped strict no-nit policies, since nits alone do not signal an active infestation.

To prevent an infestation from spreading, don’t allow head-to-head contact and don’t share or borrow hair items (e.g., combs, headbands, etc.), headgear (e.g., hats, headphones, etc.), or other personal items.

Many traditional lice treatment products use permethrin or pyrethrins to kill lice. Many lice however, have built a genetic resistance to these types of treatments over time.  These lice are called super lice.  RID^® SUPER MAX pesticide-free formulas kill lice differently, working 100% via their lice-suffocating action, thus killing even super lice. That’s why RID^® SUPER MAX and RID^® SUPER MAX Sensitive Skin treatment solutions are clinically shown to be 2X more effective than Nix^® permethrin-based lice treatment.

*Clinical Study on File: RID^® SUPER MAX Lice Treatment Solution, RID^® SUPER MAX Sensitive Skin Lice Treatment Solution versus Nix^® permethrin 1% Créme Rinse.

Nix^® is a registered trademark of Prestige Brands.

Traditional lice treatments often use pesticides such as permethrin to kill lice. Lice that have built a genetic resistance to these products over time are called super lice. RID One & Done is different because it is a prescription strength medicine in an over-the-counter lice treatment that effectively treats lice and super lice in just one application, with no tedious nit combing required*. In fact, the American Academy of Pediatrics recommends the main ingredient in RID^® One & Done (Ivermectin 0.5%) for treating super lice.

*Use as directed

After treating hair, lice can survive for 1-2 days away from a human host in the home environment. In addition, after an infestation at school or camp, your child may be re-exposed to circulating lice upon return to the same setting. That’s why RID^® SUPER MAX lice treatment solution and RID^® SUPER MAX Advanced Shampoo Lice Treatment are enhanced with lice defense ingredients to help defend against new lice for up to 3 days after treatment.

When used daily, RID^® Daily Defense Shampoo & Conditioner provides ongoing 24/7 defense against new lice upon return to school or camp. It is also safe to use as an everyday shampoo if there is a lice outbreak or it can be used by other family members if lice have been detected in the household. RID^® Daily Defense Shampoo & Conditioner is included in the RID^® SUPER MAX 5-in-1 Treat & Defend Complete Lice Treatment Kit. It is also sold separately.

All RID^® SUPER MAX head lice treatments kill lice, super lice, and eggs (nits). When using these treatments, check hair after 7 to 10 days and repeat treatment if any lice or eggs (nits) are present.

When using RID^® Lice Killing Shampoo (included in the RID^® Lice Treatment Complete Kit for Hair & Home), it is recommended that you retreat in 7-10 days to kill any newly hatched lice.