no, but isn't henna supposed to kill lice? maybe do an extra henna treatment. I'm glad you are not using the otc medicated stuff, it is super nasty and highly toxic. I'll bet borax would kill them too. I would do a strong borax soak. i wash my hair with borax all the time, about a tablespoon dissolved in very hot water, total water about 8 ounces and then rinse with water with a bit of citric acid . I don't think borax will hurt your hair at all, though I do find the borax and citric acid combo lightens my henna.