Instruct: Classify Amazon reviews into positive or negative sentiment
Query: White Trays

As I am writing this I am wearing the trays for the first time. My first impression: these are so much better than Crest White Strips! With the strips, the gel would oose out, make my mouth foamy, slip around all over, and made my teeth hurt very badly. The trays don't oose and they stay in place very well. I'm not sure about the sensitivity yet, I'm sure there will be some, but I am using Sensodyne so I am hoping that will help as well as doing right before I go to sleep so hopefully any pain will be gone by the time I wake up. I'll type up another when I have finished the treatment. :)