I've been grey since I was in my early 20's. I color it every 5 weeks like clockwork. I use the cheap junk - Clairol Nice 'n Easy. My hair is fairly consistently the same color time after time. I do screw it up with a shade change every now and then and have to go to a professional to mix it correctly and get it back. So, 20 years, 10 times a year is like 200 times. My hair is still healthy and intact. I wish I had a pretty silver-grey, but mine is more like a yucky brownish-pukish-greyish yuck!