The first ultra-fresh day and night shock whitening treatment from Guerlain that delivers intensive and continuous whitening power for 28 days. It re-balances the whiteness and evenness of the skin and dark spots lose their intensity. The skin regains and retains the immaculate whiteness of the pearl. Inspired by the unique power of pearls and enriched by the latest technological advances, Guerlain Research invented the Advanced P.E.A.R.L. Complex to permanently target both stubborn and recently-formed melanin and prevent future formation in the key layers of the skin, from the basal layer to the surface. Thanks to this Melanin Control Technology, stubborn dark spots lose their intensity, recurrent and future dark spots are deactivated, the skin glows with perfection. The skin is renewed and regains the purity and deep inner radiance of the pearl.