The treatment is done in the shower, which does make it easier, but eventually caused a problem. Once I got the the tab open on the two chambered formula, you just apply it like shampoo, wither on the roots or all over. But then my problems arose. I used it in a small shower and I ended up having to open the curtain to get some air, that stuff is strong! Next time I use it I will definitely choose a more ventilated area.
But there is no denying the results, I think it did indeed fulfill the claims that it would lighten and brighten. Overall I am satisfied with this product and would consider buying it again.