Restoria Discreet work slowly over 2 or 3 weeks to return natural looking colour to your hairrestoria Gets rid of grey hair the same way you got it, gradually. Restoria Discreet work slowly over 2 or 3 weeks to return natural looking colour to your hair. It gradually darkens grey or white through light brown& dark brown and to black if desired. You control the colour. Regular use of Restoria Discreet prevents grey root reappearing. Suitable for men a& women