In this task, You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

I recently ordered this retainer to help with my grinding. It shipped quick and worked like a charm. Unfortunately my dog got to it but customer service responded immediately and now I have a new retainer coming soon. If you have issues with grinding, this retainer is definitely worth trying out and the customer service could not get better!
positive