Going from med brown dyed hair to light brown dyed hair.?

I have been doing my natural dark brown hair med brown for ages and wish to go lighter. Will I have any trouble going lighter? I do not want to have two tones. My roots are showing about an inch and the rest of my shoulder length hair has been dyed med brown for years. Thanks.

Color will not lift color. If you want to go lighter you will need to go to a professional and have them lift your hair color up with bleach then put a demi color over it to ensure the correct color. If you are doing it at home, If you put a box color which is lighter than the color you have now it will turn your roots lighter and the rest will go darker.
I am a hairdresser... we had to learn all that in school lol

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