Instruct: Classify a review as either positive or negative.
Query: Expensive for negligible results

The kit has some nice touches, like three of everything in case you mess up. The trays to get started immediately are also nice. However, the results were not anything near what I had expected (or noticeable, for that matter). I used all of the gel and followed the instructions carefully, but my teeth have not gotten any whiter. Save your $80 for a product that works.