A deep conditioner atcs as a conditioner but it penetrates the cuticle inside the hair shaft. It should be used anywhere from once a week for people w/ dry hair (like me) or people with "regualr"...
When you need to! It is bad for your body to wait on these things. In all seriousness, are you meaning how often should you run water through it such as a vacation house? Not sure I understand this...
NEVER USE IT! IT MAKES YOUR TOUNGE BLUE, YOUR LIPS WHITE, AND YOUR TEETH YELLOW AND YOUR EYES TURN BLACK. THE DENTISTS LIE, THE SAY IT IS GOOD FOR YOU BUT IT WILL MAKE YOU DIEEEEE!
You should look...