The nits reproduce very quicky: the lice female extrude 4 to 10 nits per day and 7 days are sufficient for a nit to become a lice.<br /><br /><strong>Marie Rose Extra Strong Lotion Lice and Nits 100ml</strong> with formula without chemical insecticide acts mechanically to remove lice and nits. This lotion is also recommended to treat the whole family and avoid a risk of contamination by lice and nits.<br /><br />Proven efficiency only in one application by in-vitro and ex-vivo tests in France.<br /><br />This lotion has a delicious fragrance of apricot.