Focus on warmer areas where head lice like to live: especially the neckline, behind the ears and anywhere you find big collections of nits.
These chemicals can be absorbed through the skin, so follow the manufacturer's directions. For example, keeping the chemicals in your hair longer than the directions is not better: if the directions say to wash the product off after 10 minutes, don't wait until 15 or 20 minutes to get a better result.
