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Over-processed, overly-damaged hair is a common problem among women. Women will often change their hair color on a whim and use heated styling products daily, unaware of the damage they are creating. Do some damage control before you re-color hair to help ward off further harm.
Deep condition hair to get it back in tip-top shape. A protein-based deep conditioner is ideal for replenishing over-processed tresses. It would be best if you could do several weekly treatments before you color again.
Use a hair filler product. Hair fillers help fill in damaged spots in strands so the next color you choose will come out even and last longer. Make sure you keep the filler on hair before you color.
Color your hair with a semi-permanent shade. Semi-permanent hair color is your best bet since it has low ammonia, which means less damage than permanent hair color.