Every day but because I'm drying/styling it I suppose. If I don't wash my hair every morning, by lunch time I feel like it's about ready to get up and walk off my scalp. I hate the feeling of dirty hair. Besides, if I turned up to work with unkempt hair well, it's not a good look for work. I like having neatly styled hair. FWIW last time I went to the hairdresser's she commented on how healthy and soft my hair was. And, having a quick squiz at the ends of my hair, nope, no split ends.