I have dark brown hair and i want to go a few shdes lighter only 14 but will this affect my forever?

Dyeing your hair a few shades lighter, such as 14 shades, will not have a permanent effect on your hair. The hair dye will gradually fade over time, and your natural hair color will grow back. The amount of time it takes for the dye to fade will depend on the type of dye used, the condition of your hair, and how often you wash your hair.

If you are concerned about the long-term effects of hair dye, you can talk to your hairstylist about alternative hair coloring methods, such as highlights or lowlights. These techniques can help you achieve a lighter hair color without having to dye your entire head of hair.