Instruct: Classify Amazon reviews into positive or negative sentiment
Query: very helpful product

This product has been so helpful to me. After pregnancy I always lose oodles of hair for months and months and it takes a long time for it to all grow back. In the meantime I see day by day how my scalp is becoming more visible through my hair. Well, this time I was armed and purchased this wonderful product. I agree with the reviewer who said it can be messy to apply, but it is easy to clean and is so worth this minor inconvenience. It looks so natural that no one could tell that it's not real, at least for my color hair and type of application. I couldn't judge for someone who is trying to conceal a large bald spot. I'm just trying to make thin hair appear a little thicker. I would not, however, attempt to use this product if there were any risk whatsoever of being caught in the rain. It would certainly be messy and embarrassing.