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NYDA® (92% Dimeticone Dual Formula), scientifically proven to kill head lice in one minute and their eggs (nits) in eight hours , is a non-greasy lotion with a light citrus fragrance. You apply it to scalp and hair with the pump spray supplied with the bottle. NYDA® is a physical treatment, not a pesticide, this means you will not be using harmful chemical to poison the head lice. With its unique formula, NYDA® coats the head louse's body and rapidly penetrates its respiratory system, blocking its airways. This suffocates the louse,which is which is killed in less than a minute. In the same manner, NYDA® kills lice eggs (nits), but it takes more time. To ensure efficacy on eggs, each application of NYDA® should be left in the hair for eight hours (for instance overnight)
