Your highlights may start to dull after a couple of weeks, and by 4 weeks, you’ll probably begin to see your roots. To help maintain the shine and keep your hair in optimal condition, it’s recommended that you wash your it less frequently (1-3 times a week is enough); avoid products containing silicone, ammonia, and sulphates which dry and even break your hair; and protect your hair with a pre-wash treatment designed for colored hair. It’s a good idea to use a deeply nourishing hair conditioner, too, and avoid using heated styling products.