Instruct: Classify Amazon reviews into positive or negative sentiment
Query: not happy with product

I bought these for my husband. We were VERY dissapointed. The trays are too small and very gooey. The taste is horrible. We don't know if they whitened his teeth, because he could not get through the first day. I tried them the next day, and I agreed. They went straight to the trash.Save your money or try something else.