Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Tube half empty but good product

I ordered two sets of the product. The brightener in one set was obviously less full than the brightener in the other set. It had less than half as much as the other brightener. The cost is rather high for the product but I did see an improvement in the color of my crowns. I bought it to remove coffee stains. So I like the product.