Use a brand of treatment from the chemist and then use out shampoo that is loaded with Tea Tree oil that lice find repellent as a deterrent for re-infestation. The smell & the oil content of the natural oils will be an added deterrent & is not toxic or harmful to kids scalps. BEST PRACTICE: Test for sensitivity first as some may not be able to tolerate the Tea Tree oil. 100% vegan, Concentrated, Grey water safe, Palm oil free, No SLS/SLES.