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Treatment is done. The technician left, the bedding is washed, and your child is in bed. Now comes the part nobody fully prepares you for: how do you actually know it worked?
The answer isn't "wait and see if the itching stops." Itching can continue for weeks after lice are completely gone. Here's what to look for instead.
What Clears the Case: No Live Lice
The only reliable sign that a case is resolved is the absence of live lice. Not the absence of itching, not fewer nits in the hair, not a clean-looking scalp. Live bugs are what drive reinfestation. If there are none, the case is over.
The LiceDoctors technician confirms this at the end of every visit with a strand-by-strand nit check. She goes through the hair looking for anything that was missed during the comb-through phase. That final check is what gives parents confidence the case is actually resolved — not just treated.
Why Itching Doesn't Tell You Much
Itching is an allergic reaction to lice saliva. According to the CDC, in a first infestation it can take 4 to 6 weeks to develop — and once it starts, it can persist for weeks after the lice are gone while the scalp recovers. Your child may itch for two or three weeks post-treatment and be completely clear.
Conversely, some people barely itch at all even with an active case. Itching alone is not a reliable indicator in either direction.
How to Check at Home After Treatment
Your LiceDoctors technician leaves you with an aftercare plan that includes follow-up comb-throughs. Here's what to look for during those checks:
Live lice: Any bug that moves is a live louse. A single live louse found within the first week of treatment is concerning and worth a call to LiceDoctors. One found three or more weeks later is more likely re-exposure than a missed bug.
Nits close to the scalp: Nits within a quarter inch of the scalp are either unhatched or very recently laid. These warrant attention. Nits further down the hair shaft — half an inch or more — are almost certainly old casings from before treatment that were missed during the nit check. They're not active.
Empty casings vs. unhatched nits: Empty (hatched) casings are white or clear and slightly flattened. Unhatched nits are tan or yellowish and more oval. If you're only finding clear casings far from the scalp after treatment, that's usually not cause for alarm.
How Long to Keep Checking
Daily or every-other-day comb-throughs for the first week after treatment, then every few days through week two. By the end of two weeks with no live lice found, the case is cleared.
Use the LiceDoctors Terminator Comb — the same professional-grade metal comb used during the visit. Drugstore plastic combs miss too much to be a reliable aftercare tool.
If Something Shows Up Again
If you find live lice after treatment, LiceDoctors' 30-day guarantee covers a return visit at no charge, provided the aftercare instructions were followed. Call 800-224-2537 to schedule.
If lice appear more than three weeks after treatment, re-exposure from school, a sleepover, or a household member who wasn't checked is more likely than treatment failure.
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