Control gx shampoo gives you superior control over the amount of grey in your hair this means you can gradually restore your greys to their natural shade to achieve the look you want youll start to see a slight reduction in grey hairs after your first few washes then you simply continue using the shampoo until you get the right level usually 2 4 weeks r r you can even change how gradually you reduce your greys by using the shampoo daily or every other day for a subtler transformation