I used to use shampoo everyday, until I was informed it aggravates oily hair and face conditions by stripping away oils with every shampooing, causing your skin to overcompensate by creating even more oil. So now I only shampoo 2 or 3 times a week. I run very warm to hot water to give my hair a good cleaning with every shower. The other result is that I'm still on the same bottle of shampoo for over a year.