Prevent Lice Before it Happens. A 3-piece, non-toxic system clinically tested to help prevent head lice infestation. All products are formulated with a proprietary blend of natural Tea Tree, Neem, Rosemary, Peppermint, Lavender, and Eucalyptus oils to effectively help repel head lice. Lice Guard System is effective, yet gentle enough for daily use. For maximum results layer all the products. Includes: 1- 8 Fl. Oz. Lice Guard Shampoo. CLINICALLY PROVEN 97% EFFECTIVE TO HELP REPEL HEAD LICE. 1- 8 Fl. Oz. Lice Guard Detangler. CLINICALLY PROVEN 95% EFFECTIVE TO HELP REPEL HEAD LICE. 1- 4.2 Fl. Oz. Lice Guard Gel. CLINICALLY PROVEN 99% EFFECTIVE TO HELP REPEL HEAD LICE.