How often should you change your shampoo?

Re: How often should you change your shampoo?

Means use 2 or 3 shampoos per month like each time you wash , grab a different shampoo?

I see.

What difference do you notice each time you change?

I have been using Redken for the past 8 months, i used golden , red and golden again. I am thinking to get AUSSIE shampoo. Has any one used Aussie?