If you find lice, your child should be treated. If your child has not been treated for head lice before, and you only find eggs, you should consider treating for head lice. However, another option if you do not want to use insecticidal treatments, is to check again the next day using the conditioner and comb technique. If your child has been treated recently, and you find only hatched eggs, but no lice, you may not need to treat since the eggs could be from the old infection. You should check your child every week using conditioner, a fine tooth comb, and paper tissue as described above.
Head lice live in the hair and come down to the scalp to feed by sucking blood .
So head lice formulations must be applied to all parts of the hair. A complete regime consists of two treatments 7 days apart, the first to kill the climbers, and the second to kill the juvenile lice hatched from the eggs over the intervening 6 days. No product currently available kills all eggs. Apply the product to all areas of the head and coat all hairs from roots to tips. If you are using lotions, apply the product to dry hair.