My naturally mouse brown hair has started going grey at the roots the past few years (40's). I was trying to box dye it but it wouldn't cover (if at all) for longer than a week and I hated doing it. Now having half head highlights every 4 weeks to blend the grey and so overall look is lighter but after a week the greys show again - if they even cover in the first place. Everyone talks about the choice between colouring and going grey - I'm choosing to colour but STILL can't successfully cover the grey. Help!