Instruct: Classify Amazon reviews into positive or negative sentiment
Query: No More Nasty Chemicals - and Last Forever

This is the cheapest version of the product. Just a big piece of rock crystal. May be hard to believe that something like this is very effective until you try it. Too different from conventional deodorants. You may have to moisten the surface a bit before application.Pros:- It really works.- Natural. Made from a certain type of mineral salts- Very inexpensive. It will last for years to come.- Absolutely no scent- Non-staining- Practically Invisible- Not sticky at all.Cons:- Remember, this is a deodorant not an anti-perspirant- Just one big piece of crystal rock. May have some rough edges.