How to dye hair to get rid of lice? - briefly
Applying a chemical hair dye, especially a permanent formula with strong agents like ammonia, can kill some lice and nits, but the effect is inconsistent and may damage hair or scalp. For reliable eradication, use approved lice treatments such as permethrin or ivermectin shampoos before or instead of dyeing.
How to dye hair to get rid of lice? - in detail
Applying a permanent or semi‑permanent hair color can serve as a supplemental measure against head‑lice infestations, but it must be performed with strict adherence to safety guidelines.
First, select a dye that contains a high concentration of ammonia and peroxide, typically found in 6 % or stronger formulations. These chemicals alter the cuticle’s pH and protein structure, creating an environment that is hostile to lice and their eggs. Avoid products marketed solely for cosmetic purposes that lack sufficient oxidative strength, as they will not affect the parasites.
Second, prepare the scalp by removing all visible nits with a fine‑toothed comb. This reduces the number of eggs that could survive the dyeing process and improves contact between the chemical agents and the insects.
Third, follow the manufacturer’s instructions for mixing and applying the product:
- Mix the colorant and developer in the recommended ratio (commonly 1:1 or 1:2, depending on the brand).
- Apply the mixture evenly from the roots to the tips, ensuring full coverage of the hair shaft and scalp.
- Allow the solution to remain for the full processing time, usually 30–45 minutes. Extending the exposure beyond the stated period can increase the risk of scalp irritation or chemical burns.
- Rinse thoroughly with lukewarm water, then shampoo with a mild, sulfate‑free cleanser to remove residual chemicals.
After rinsing, inspect the hair again with a nit comb. Any remaining eggs should be removed manually. Repeat the entire dyeing cycle after 7–10 days if live lice are still detected, as newly hatched nits may have survived the first treatment.
Precautions are essential:
- Perform a patch test 48 hours before full application to detect allergic reactions.
- Do not use this method on children under 12 months, pregnant or nursing individuals, or persons with compromised scalp health.
- Avoid combining chemical dyes with insecticidal shampoos or lotions in the same session, as interactions may cause heightened toxicity.
- Maintain proper ventilation during application to limit inhalation of fumes.
While hair dye can reduce lice populations, it does not guarantee complete eradication. Complementary measures—such as washing bedding at 60 °C, vacuuming furniture, and using a proven pediculicide—are recommended to achieve total elimination.