Removing lice eggs (nits) from hair requires physical removal with a fine-toothed comb. No home remedy reliably kills eggs on its own. The most effective approach combines a slippery substance to lubricate the hair with systematic combing every two to three days for at least two to three weeks, covering the full egg-hatching cycle of eight to nine days.
Why Most Home Remedies Don’t Kill Eggs
A study testing six common home remedies found that vinegar, olive oil, mayonnaise, melted butter, and isopropyl alcohol did little to kill lice eggs even after prolonged exposure. Petroleum jelly performed best, allowing only 6% of eggs to hatch, but it’s extremely difficult to wash out of hair. The bottom line: none of these products worked well enough to control an infestation on their own.
The reason is simple. Lice eggs have a hard protective shell cemented to the hair shaft. Suffocating or dissolving that shell is far harder than killing a live, breathing louse. Even treatments that slow adult lice down rarely stop eggs from hatching days later, which is why the infestation keeps coming back.
How to Tell Nits From Dandruff
Before you start combing, make sure you’re actually dealing with lice eggs. Nits are tiny, teardrop-shaped, and glued firmly to one side of the hair shaft, usually within a quarter inch of the scalp. They don’t slide easily. If you try to pull one off with your fingers, it resists.
Dandruff flakes and hair casts (sometimes called pseudonits) look similar at first glance but behave differently. Hair casts are white, cylindrical, and slide freely up and down the strand when you pinch them. Dandruff flakes off the scalp entirely. If what you’re seeing moves easily or falls away, it’s probably not a nit.
Wet Combing: The Core Technique
Wet combing is the single most important tool for physically removing nits at home. You’ll need a metal nit comb with long, closely spaced teeth. Plastic combs from drugstore kits are less effective because the teeth flex apart and let eggs slip through. Metal combs keep their narrow spacing and catch both nits and small live lice.
Here’s how to do it:
- Saturate the hair. Apply a generous amount of regular conditioner, olive oil, or coconut oil to wet hair. This lubricates the strands so the comb glides through and makes it easier to see lice against the slick surface.
- Section the hair. Use clips to divide hair into small sections, roughly one to two inches wide. Work through one section at a time from root to tip.
- Comb from the scalp outward. Place the comb as close to the scalp as possible and pull slowly through to the end of the hair. After each pass, wipe the comb on a white paper towel or rinse it in a bowl of warm water so you can see what you’re pulling out.
- Repeat each section. Comb through every section at least three to four times from different angles. Nits that sit on the underside of a strand can be missed on a single pass.
A thorough session takes 30 to 45 minutes on medium-length hair and longer on thick or curly hair. It’s tedious, but this is what actually works. A clinical trial found wet combing alone cured about 38% of infestations when done every three to four days over two weeks. That’s lower than medicated treatments, which cured 78% in the same study. The difference underscores that combing needs to be extremely thorough and repeated consistently to succeed without medication.
Timing and the Hatching Cycle
Lice eggs hatch in about eight to nine days. Any egg you miss during combing will produce a new louse that can start laying its own eggs within another week or two. This is why a single combing session, no matter how careful, won’t end an infestation.
Comb every two to three days for a full two to three weeks. The goal of each session is to catch newly hatched lice before they’re old enough to reproduce. If you stop too early, even one surviving nymph can restart the cycle. Mark your calendar and treat it like a course of antibiotics: the schedule matters as much as the technique.
What About Essential Oils?
Tea tree oil has more research behind it than most natural options. Studies show that tea tree oil at concentrations of 1% to 8% killed between 59% and 100% of eggs, with higher kill rates when dissolved in alcohol rather than water. Oregano oil at just 1% concentration killed 99% of eggs in one laboratory study.
These numbers sound promising, but lab results don’t always translate to real-world use. The oils were applied under controlled conditions, in precise concentrations, for specific durations. At home, it’s hard to replicate that. Essential oils can also irritate the scalp, especially in children or anyone with sensitive skin. If you want to try tea tree oil, adding a few drops to your combing conditioner is a reasonable low-risk approach, but don’t rely on it as your primary treatment.
Using Heat to Kill Eggs
Heat is one of the few things that reliably kills lice eggs. A study testing different heated-air devices found that a standard handheld blow dryer killed up to 98% of eggs when directed carefully through sections of hair for about 30 minutes. The key is sustained, focused airflow rather than brief passes.
To try this at home, work through small sections of dry hair with your dryer on a warm (not hot) setting, holding the nozzle close to the scalp and moving slowly along each strand. Sessions in the study lasted about 30 minutes total, with breaks if the child felt discomfort. Body lice, which are close relatives of head lice, die after just five minutes of exposure to air at about 122°F (50°C). Keep the temperature comfortable to avoid scalp burns, especially on children.
Blow-drying works best as a complement to combing, not a replacement. Heat desiccates eggs in place, but dead eggs still cling to the hair shaft. You’ll still need to comb them out if you want them gone visually.
Substances That Help With Combing
The lubricant you apply before combing serves two purposes: it slows live lice down (making them easier to catch) and it allows the comb to pass through hair without painful snagging. Any of the following work about equally well for this purpose:
- Hair conditioner (cheap, easy to wash out, widely available)
- Olive oil (slightly harder to rinse, but very slippery)
- Coconut oil (solid at room temperature, so warm it first)
Don’t expect any of these to kill eggs. Their value is purely mechanical. They make combing easier and more effective, which is the actual treatment.
What to Avoid
Gasoline and kerosene should never be used. They’re flammable and toxic. Covering a child’s head in mayonnaise or oil and then wrapping it in a plastic bag creates a suffocation hazard. A toddler in Massachusetts died when a plastic bag used during a mayonnaise lice treatment slipped over her face while she was unattended.
Vinegar is often recommended to dissolve the glue holding nits to hair. In practice, it doesn’t loosen eggs enough to make a meaningful difference, and concentrated vinegar can irritate or burn the scalp, particularly if there are scratches from itching. If you notice redness, rawness, or broken skin on the scalp, skip any acidic or oil-based treatments until the skin heals.
A Practical Schedule
Day one, do a thorough wet combing session. Follow it with blow-drying on a warm setting. Repeat the combing on day three or four, then again every two to three days. After each session, wash combs in hot water (at least 130°F) for five to ten minutes. Wash pillowcases and any hats or hair accessories used in the previous two days in hot water and dry on high heat.
Continue checking and combing for a full two to three weeks after you last find a live louse or viable nit. Lice can’t survive off the head for more than one to two days, so you don’t need to deep-clean your entire house. Focus your energy on the hair itself, because that’s where the battle is won or lost.