Instruct: Classify a review into positive or negative sentiment.
Query: Don't bother with this product

I purchased 2 of these whitening kits (1 for me and 1 for my boyfriend). After 2 hours of whitening our teeth we saw no results. It wasn't until the next day that you could see the results on my boyfriend's teeth, which he'd never whitened before. I would say that they were lightened 2 maybe 3 shades but not enough to justify using the product for 2 hours. I whiten my teeth once or twice a year and this product maybe whitened my teeth 1 shade. On top of that the whitening gel made both of our gums and teeth sensitive, my gums peeled for 3 days!Pros:Trays are comfortable and easy to moldif you have 2 hrs to spend whitening, it beats 2 weeks of 30 min applicationsCons:Not enough whitening results for using the whole kit.Gel causes more sensitivity than other whitening products I've tried.I wouldn't recommend this product to anyone I like, nor would I purchase it again.