Has anyone else tried this? I've only gone a few days (never on purpose), and the result is some pretty oily, flat, ugly hair. I never thought that going longer would restore things to normal.
I can see the logic behind what he's saying, but it would only work if you never use any kind of product on your hair, such as gel, styling paste, etc.
I wouldn't call shampoo a great expense. I mean it costs what, $50 a year?