Despite what your hairstylist or friends might tell you, you absolutely cannot predict what your gray hair will look like until almost all of the dye is cut off. That dye reflects off the transparent ("gray") hair and muddles your perception of the color. Here is a picture of my hair at 5 months vs. fully grown out to illustrate the point: If you grow out your gray hair and you find that it does not suit you, you can always go back to dyeing. But Mother Nature generally gives you the best hair shade to suit your skin tone. Read: Help, I Hate My Gray Hair! and Gray Hair Before & After