No! No! You should never dye it back! After two years of pain and looking frankly quite shit, why would you DO that? Just to have to do it all again, one day?
My advice would be to anyone finding their first few greys now would be LEAVE THEM. The trauma, at 46 of trying to keep the badger at bay on my dyed dark hair is just awful!
I am fairly dark haired naturally but I went grey quite young and I am now probably 50% white/grey, mostly at the front.
I have no idea how it would look, if I could ataully let it come through - maybe I'd hate it. But the most I would EVER recommend for someone in my situation is that they wait until the grey is about 25% and then start on a programme of mixed coloured soft highlights to blend the grey. That way it is a gradual process.
Honestly I feel like a hostage to my permanent all over medium dark brown. And it never looks that nice anymore, even when freshly done. The depth of colour is not the same and it looks patchy and uneven, my white roots are through after 2-3 weeks and I can't seem to find a hairdresser to get hte shade just right any more. I am thoroughly fed up with it.
If I was skinny I'd have the whole lot cropped off and start again, but at the moment I'd look like a football with a pea on it. 