I've been using this product for years. I buy it at my local Sprouts store. I have dark brown, fine, wavy hair that is shoulder length. I use it for grey coverage. One bottle lasts 2-3 applications for me. I love the ease of use and the way my hair feels and looks after. I use the Dark Brown shade and have tried the Chocolate shade as well. Applications lasts me 3-4 weeks, depending on how often I shampoo, which I'm happy with. I did not want to use conventional coloring on my hair, ever, and this is a great option. Also, thank you for including the trial-sized clarifying shampoo in each box.