Started using after various other methods of root coverup between hair salon visits (including a cumbersome crayon stick) proved less than effective or attractive. Learned early on though, as it only comes off after shampooing, that I shouldn’t apply before visiting hairdresser as it appears to have an effect on how my “regrowth touch-up” takes to my root area. You live and learn!!! Choosing the right colour is difficult as the choices are limited so it can be a real trial and error. It’s not cheap so I now stock up when on sale.