Combing out nits works best on wet, conditioner-coated hair using a fine-toothed metal comb, and it typically takes 10 to 30 minutes per session depending on hair length. Done consistently every two to three days for at least two weeks, wet combing alone can clear a head lice infestation without any chemical treatments. Here’s exactly how to do it.
Why Wet Combing Works
Nits are glued to individual hair shafts with a cement-like substance that makes them surprisingly hard to remove on dry hair. Coating the hair in regular conditioner does two things: it lubricates each strand so the comb can slide from root to tip without snagging, and it immobilizes live lice, making them easier to trap in the comb’s teeth. You don’t need a special conditioner. Any thick, standard hair conditioner will do.
Studies comparing wet combing to over-the-counter insecticide treatments show it holds its own. In one trial, wet combing cured 57% of cases while chemical treatments cleared only 13%, largely because lice in many areas have developed resistance to common pesticides. Another study found a 75% cure rate with consistent wet combing over two weeks. The key variable in every study is consistency: people who stick with the schedule get results.
Choosing the Right Comb
Not all nit combs are equal. Metal combs with very narrow tooth spacing outperform plastic ones. In a direct comparison of commercial combs, metal combs with tooth gaps as small as 0.09 mm removed significantly more eggs and lice at every life stage than plastic combs with gaps of 0.23 mm or wider. The tighter spacing catches nits that slip right through a plastic comb.
Look for a long-toothed metal lice comb, sometimes sold as a “nit comb” at pharmacies. The teeth should be rigid, not flexible, and long enough to reach through thick hair. Avoid the flimsy plastic combs that come bundled with chemical treatment kits.
Step-by-Step Combing Process
Start by washing the hair with ordinary shampoo. Then apply a generous amount of conditioner, enough to thoroughly saturate every strand from roots to tips. Don’t rinse it out yet.
Use a regular wide-toothed comb first to straighten and detangle the hair. Keep working through it until the comb glides freely with no resistance. This step prevents painful pulling once you switch to the fine-toothed nit comb, and it’s especially important for curly or long hair.
Once the hair is fully detangled, pick up your metal nit comb. Slot the teeth into the hair right at the roots, with the bevelled edge of the comb lightly touching the scalp. Draw the comb slowly and firmly all the way down to the ends of the hair in one smooth stroke. After every single stroke, check the comb’s teeth. You’ll see nits (tiny white or yellowish-brown ovals), live lice, or both caught between the teeth. Wipe the comb onto a white paper towel or rinse it in a bowl of water before the next stroke. The white background makes it much easier to see what you’ve pulled out.
Work through the entire head section by section. Clip the rest of the hair up and out of the way so you can focus on one small portion at a time. This prevents you from accidentally skipping areas. For short hair, expect the combing to take about 10 minutes. For longer or thicker hair, budget up to 30 minutes.
Once you’ve gone through the whole head, start over and comb through a second time. This catch pass picks up anything you missed on the first round.
How to Tell Nits From Dandruff
Nits sit close to the scalp, typically within a quarter inch of the skin surface, because they need body heat to incubate. They’re oval-shaped and either white or yellowish-brown. The simplest test: try to flick the speck off the hair strand. Dandruff slides off easily. Nits don’t. They’re cemented in place and will only come off when you drag them along the full length of the strand with a comb or pinch them between your fingernails and slide them off.
The Schedule That Actually Clears an Infestation
A single combing session, no matter how thorough, won’t end an infestation. Nits hatch in six to nine days, so eggs you missed on day one can produce new lice by day nine. The combing schedule has to outlast this cycle.
Comb every two to three days for a minimum of two to three weeks. The most studied protocol calls for combing every three days and continuing until you’ve had four consecutive sessions where you find zero lice and zero nits. If you find even one nit or louse, reset your count. Some infestations take up to 24 days of consistent combing to fully clear, so don’t get discouraged if the first two weeks aren’t enough.
This schedule works because it catches newly hatched nymphs before they’re old enough to lay eggs themselves. A nymph needs about nine to twelve days after hatching to mature and reproduce. By combing every two to three days, you remove each new generation before it can start the cycle over.
Cleaning Your Tools and Preventing Reinfestations
After every combing session, soak your nit comb and any hair clips you used in hot water, at least 130°F, for five to ten minutes. This kills any lice or eggs clinging to the tools. Tap water from most home water heaters reaches this temperature, but if yours is set lower, heat water on the stove.
Lice can’t survive long off a human head. They die within one to two days without a blood meal. Still, it’s practical to machine wash pillowcases, hats, and any fabric that touched the head in the previous 48 hours using hot water. You don’t need to bag up stuffed animals for weeks or fumigate your home. Focus your energy on the combing schedule, which is what actually eliminates the infestation.
Tips for Thick, Curly, or Long Hair
The detangling step matters most for these hair types. Use extra conditioner and take your time with the wide-toothed comb before switching to the nit comb. For very thick hair, divide the head into at least six or eight sections rather than three or four, clipping each one securely out of the way. Smaller sections let the nit comb reach the scalp on every stroke instead of gliding over the surface.
On tightly coiled hair, you may find it easier to work with smaller subsections and comb slowly to avoid breakage. The conditioner is doing double duty here, both lubricating the strand and making nits visible as they get pulled to the hair’s surface. Rinse and reapply conditioner mid-session if the hair starts to dry out, because the comb won’t glide effectively through hair that’s lost its slip.