Getting rid of nits requires physically removing them from the hair shaft, since most lice treatments kill live lice but leave the eggs behind. Nits are glued to individual strands of hair with a cement-like substance that won’t wash out with regular shampoo, so you need a combination of the right tools, proper technique, and repeated sessions over about two weeks to fully clear an infestation.
Make Sure They’re Actually Nits
Before spending hours combing, confirm what you’re looking at. Nits are tiny oval-shaped eggs, white or yellowish-brown, found within about a quarter inch of the scalp. They’re easy to confuse with dandruff, hair spray flakes, or dry skin. The simplest test: try to flick the speck off the hair strand. Dandruff slides right off. Nits don’t budge because they’re cemented in place.
Location matters too. Nits laid close to the scalp are the ones likely to hatch, typically within 8 to 9 days. Nits found more than a quarter inch from the scalp are usually either empty shells or dead, since they need the warmth of the scalp to develop. Those old casings can cling to hair for weeks or even months after an infestation is over, which is one reason “no-nit” school policies have fallen out of favor. Both the American Academy of Pediatrics and the CDC say nits alone aren’t a reason to keep a child home from school.
Choose the Right Comb
Not all lice combs are created equal. The tooth spacing determines whether you’re catching nits or letting them slip through. A comb with teeth spaced around 0.2 to 0.3 inches apart can snag adult lice but tends to miss nits entirely. For effective egg removal, you need teeth spaced closer to 0.09 inches. Metal combs with rigid, finely spaced teeth outperform the flimsy plastic ones that come packaged with many over-the-counter treatments. Look for a long-handled, stainless steel nit comb with micro-grooved teeth.
The Wet Combing Method
Wet combing is the most reliable way to remove nits mechanically, and it works whether or not you’ve also used a chemical treatment. Here’s the process:
- Wash hair with regular shampoo and then apply a generous amount of any ordinary conditioner. The conditioner makes the hair slippery, which stuns live lice (they can’t grip as well) and lets the comb glide through without yanking.
- Section the hair into small clips or segments so you can work through the entire head systematically.
- Comb from root to tip with the fine-toothed nit comb, wiping it on a white paper towel or tissue after each pass so you can see what’s coming out.
- Comb through the entire head twice. The first pass catches the bulk. The second catches what you missed.
Expect the process to take about 10 minutes for short hair and 20 to 30 minutes for long, curly, or thick hair. It’s tedious, but thoroughness is what makes it work.
Why You Need to Repeat It
A single combing session won’t end an infestation. Any nits you miss will hatch within about 8 to 9 days, producing new lice that can lay new eggs. The NHS recommends wet combing on days 1, 5, 9, and 13, then checking again on day 17. This schedule is designed to catch newly hatched lice before they’re old enough to reproduce, breaking the cycle completely. Skipping a session, especially around days 9 and 13, gives stragglers a chance to mature and start the whole problem over.
Over-the-Counter Treatments
Most drugstore lice treatments use permethrin or pyrethrin as their active ingredient. These kill live lice on contact but do very little to nits. That’s why the packaging always instructs you to retreat 7 to 10 days later, catching lice that hatched after the first application. Even with chemical treatment, combing out nits speeds up the process and reduces the chance of a new cycle starting.
One growing problem is resistance. Lice in many regions have developed tolerance to permethrin-based products, which means the treatment may not kill all the live lice either. If you’ve used an over-the-counter product correctly, including the second application, and you’re still seeing live crawling lice, it’s worth moving to a prescription option.
Prescription Options That Skip the Nit Combing
Several prescription treatments are effective enough that nit combing becomes optional rather than essential. Two stand out for convenience:
Ivermectin lotion (0.5%) is applied once to dry hair and left on for 10 minutes. It’s effective for most people as a single treatment without any nit combing. It’s approved for anyone six months and older. You shouldn’t retreat without talking to your provider first.
Spinosad suspension (0.9%) also doesn’t require nit combing. You apply it to dry hair, leave it for 10 minutes, then rinse. A second treatment is only needed if you see live, crawling lice seven days later. It’s also approved from six months of age.
These are particularly useful for families dealing with resistant lice or for young children who won’t sit still through a 30-minute combing session.
Do Home Remedies Work?
Mayonnaise, olive oil, petroleum jelly, and coconut oil are all popular suffocation remedies. The idea is that coating the hair in something thick and oily blocks the lice’s breathing holes. One pilot study reported cure rates of 95 to 97% using a suffocation-based lotion, with 94% of participants still lice-free at six months. However, those results came from a small trial, and larger independent studies haven’t confirmed whether everyday kitchen ingredients perform as well as a purpose-formulated product.
If you try a suffocation approach, keep your expectations realistic. These substances may slow down or kill some adult lice, but they don’t dissolve the glue holding nits to the hair shaft. You’ll still need to comb out the eggs. Coating the hair in oil does have one practical benefit: it makes nit combing easier, much like conditioner does.
Cleaning Your Home
Lice can’t survive long without a human host. Nits that fall off the head will generally die within a week and cannot hatch at temperatures lower than those near the scalp. So you don’t need to fumigate your house or throw away stuffed animals. Focus on items that touched the head in the past 24 to 48 hours:
- Bedding and pillowcases: Strip them and wash on the hottest water setting your fabric allows, then dry on the hottest dryer setting.
- Recently worn clothing: Wash and dry on hot, same as bedding.
- Items you can’t wash (pillows, quilts, stuffed animals): Run them through the dryer on high heat for 20 to 30 minutes.
- Brushes and hair accessories: Soak in hot water (at least 130°F) for 10 minutes, or seal in a plastic bag for two weeks.
Skip the lice sprays for furniture. Vacuuming upholstered surfaces and car seats is sufficient. Lice spread through head-to-head contact, not by jumping off couches.
Preventing Reinfestation
The most common reason nits “come back” is that they never fully left. Either some were missed during combing, or the treatment didn’t kill all the live lice, which then laid new eggs. Sticking to the full combing schedule through day 17 is the single most effective prevention step.
Beyond that, check every household member. Lice spread through direct head-to-head contact, which is why they move easily among siblings and family members sharing a bed. Treating one child while an untreated sibling still has lice guarantees reinfestation. If one person in the household has lice, comb and check everyone. Treat anyone who has live lice or nits close to the scalp, and save yourself a second round of laundry.