Instruct: Classify Amazon reviews into positive or negative sentiment
Query: happily surprised

Bought this after breaking a molar from what was diagnosed as severe clenching during sleep. Was skeptical, but purchased the SleepRight Adjustable Select after reading such good reviews. So surprised at how great it is for the price. It took a couple nights to get used to it, but now I can't sleep well without it because I can tell I'm clenching. Stays in my mouth all night. I barely notice it. I will purchase another as a back up for sure. Works great and for the price, it is worth a try.