There are 2 steps for treating lice. Chemical treatment with the use of a medicated shampoo is the first step. When using this special chemical laden shampoo, do not apply it in bathtub or shower. Apply over sink to minimize the exposure of the chemical to the rest of the body.
The second step for treating lice is manual removal. For this you will need a fine tooth metal comb specially designed for lice removal. Comb out hair removing all tangles and debris. Work on one section of the hair at a time and comb each section away from scalp. Clean off the comb after each stroke to remove any caught lice or eggs. Repeat this technique throughout the head carefully inspecting the hair. Remove nits with fingernails or safety scissors if nits remain after several attempts with the comb.