Tea Tree Oil has amazing anti-bacterial properties when diluted by no less then 5%. It can just as well be used undiluted.
Tea tree oil will help to soothe your itchy scalp and prevent infections. Simply apply tea tree oil to the scalp.
It may also be used to treat dandruff, lice, and under-active sebaceous glands, as well as to enliven the scalp and bring the cells & follicles to attention.