Instruct: Classify Amazon reviews into positive or negative sentiment
Query: NO STARS! (You should have a slot for NO STARS)

This is possibly the worst product I have ever purchased...and at such a high price, no wonder it is no longer manufactured! My $5 Crest Spinbrush works 5 times better than this Interplak product, which cost me 5 times more! I threw out the packaging immediately b/c I had faith it would work and now I can't return it and get my money back! The brush and motor work extremely slow and do not clean properly...it is totally worthless....