Follow some basic tips to prevent or manage the damage to colour-treated hair. Always shampoo and condition colour-treated hair with warm water. When using a hair dryer, switch to a cooler setting and stop before your hair is completely dry. Before going to the beach, wet your hair with cool or warm tap water and apply a leave-in conditioner. Taking a quick shower before getting into the pool saturates your hair with cleaner water, so that it will absorb less chlorine. Wearing a wide-brimmed hat will not only protect your hair and scalp, but it will also shelter you from the damaging UV rays.