Our shampoo and oil are blended with full strength pure essential oils that are reputed to clear and deter the menace of head lice. To use- If present massage the oil into the scalp with fingertips and rinse out before washing the hair using the shampoo following directions on both bottles. If using as a deterrent due to friends having head lice or a problem in school only the shampoo is needed, wash hair using this each night or morning. Our Head Lice Shampoo & Oil are both SLS Free & Parabens Free!