The most important part of the treatment is the bit where you comb thru to get all the nits/eggs out. You can use oil or conditioner to dissolve the glue that holds the eggs to the hair shaft, but you need to divide the hair into sections and comb thru carefully from the scalp, wiping each time to remove eggs/dead lice from the comb. Repeat every 3 or so days until no more eggs or critters appear.