My hair always looks fab when I come out of the hairdressers and gradually goes downhill. The colour changes from a nice shade of brown to a orangey brown and the condition goes frizzier and dryer. Wondering if investing in something like kerastase or the stuff they use in the hairdresser will make a difference? I have dyed brown hair (would be grey), tendency to frizz and really thick if that makes any difference! Thanks!