Instruct: Classify Amazon reviews into positive or negative sentiment
Query: petzlife oral care review

this product is not working. i dont see any inprovement in my dog's tartar. besides, he does not like the taste of it. if i give him a toothpaste that i bought from the store, he likes the flavor. but with this product, you can really see that he does not like the taste of it. the yellowish discoloration in his tooth is not getting any better.