Instruct: Classify a given review as either positive or negative.
Query: Disappointed with this product!

Tomorrow I have to return this item because after less than 3 weeks of use the pump has malfunctioned. I did enjoy the clean mouth I had after using it but another drawback was that it was unbelievably noisey. Before buying this I spoke with an acquaintance who mentioned that he had bought one and in less than two years (which is the lenght of the warranty, his model also had suddenly died) But I didn't expect this item-which was recommeded by my dentist , to be such a disappointment.