To dream of hair represents the type of thoughts that you're having. Your mindset. The color and style of the hair represents the manner in which you are thinking.
If you dreamed of dying your hair, you are allowing vanity to overcome your common sense.
Try to use better judgement.
If you dyed your hair black, the dream predicts a passing sadness concerning your own decision to make a break in a personal relationship which has become upsetting.
To dream of bleaching your hair, suggests that you would be wise to be somewhat less flirtatious.