What ruins dyed hair?

Dyeing your hair can be a great way to change up your look, but there are certain things that can cause damage and ruin the color of your hair. Exposure to the sun, chlorine, and salt water can all fade hair color, as can excessive heat styling and over-washing. In addition, certain harsh chemical ingredients in hair products, such as sulfates, can strip hair color. To help keep your hair looking vibrant, use a color-safe shampoo and conditioner, avoid too much heat styling, and use a deep conditioning treatment to help keep your color looking fresh.