Restoria works with the natural chemistry of the hair to gradually reduce greyness, returning hair to its natural looking colour. Unlike most products for grey hair which dye hair instantly, Restoria works over a period of 2 to 3 weeks thus helping to avoid the embarrassment that can be caused by a sudden change in hair colour. Restoria is simple to use, requires no mixing and causes no mess. Available for sale within the UK and Ireland only.