<p>NYDA® express uses a unique combination of dimethicones to suffocate head lice and their eggs. &nbsp;</p><p>Some traditional head lice treatments target the nervous system of the louse, but unhatched eggs haven't developed a nervous system yet.&nbsp;</p><p><strong>However, head lice at every stage of the life cycle need to breathe.&nbsp;</strong></p><p>That’s why NYDA® express uses an innovative dual dimethicone formula to deeply penetrate the airways of eggs and adult lice to stop them from breathing.</p><p>This unique suffocation method has been scientifically proven to kill head lice in 1 application* (no repeat treatment necessary) without any burning or harsh chemical smell.&nbsp;</p><p>* <a target="_blank" rel="noopener noreferrer nofollow" href="http://ÖKO-TEST.App">ÖKO-TEST.App</a> Eltern 11/2017</p><p>** We recommend checking hair again 8-10 days after treatment. If the treatment solution does not completely cover all hair, some eggs may not be killed and may hatch up to 7-8 days later. If any live head lice are detected, repeat treatment and check hair again in a further 8-10 days.</p>