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A member asked:

What causes headlice to come back?

A doctor has provided 1 answer

Hatching/re-exposure: You may have missed some of the existing egg casings attached to the hair with earlier treatment.They can resist some forms of treatment, hatch and become mature within 10 days.They will they lay eggs and start over.You can also be re-exposed to a source and start over.

Answered 5/28/2014

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