Sorry if this is a daft question. I’m 31, suddenly have tonnes of grey hairs popping out of absolutely no where. I‘be never coloured so I’m complete newbie to hair colouring. I have dark brown hair so the greys are sparkling like a disco ball on my head. What are you meant to do? Do I use a box dye all over my hair then start doing root touch ups? I started snipping the greys when I found them a few months ago but now can’t keep up as it’s so many.