They are not normally removed by the treatment, and will eventually grow out or fall off. Repeat the treatment a week later to kill any new lice that have hatched since. It may not be necessary to treat the whole family. If you are one of the many people who worry about applying strong insecticides, there are alternatives you can try. Lavender oil is said keep head lice away - they are supposed to dislike the smell.
Some people recommend rosemary, geranium, tea tree, bergamot or eucalyptus oils.
Remember that concentrated essential oils are toxic, so always dilute them before application. Add 6 drops of three of these oils to 2 tablespoons of sunflower oil, and rub all over the scalp and hair. Leave overnight, and then shampoo your hair. Bug busting' is another alternative treatment. This involves combing your wet hair with a head lice comb every 3-4 days for 2 weeks to remove all lice as they hatch, so that none reaches maturity to produce the next generation of eggs.