Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good Shampoo

I have been using Nioxin products for a few years. My hair is very fine and I have hard water......the combination leaves my hair feeling/looking terrible. I don't know if it actually "thickens" a person's hair....however it does leave my scalp feeling great and my hair looking full because as all of the gunk has been efficently removed.If in doubt, give it a try for your self and decide. This large bottle lasts me approximately 4 months (I generally wash my hair once a day).