Instruct: Classify Amazon reviews into positive or negative sentiment
Query: nice toothbrush

Very happy with this toothbrush. It felt a little funny to use at first, but just like instructions said I became accustomed to it in a few days. My gums seem a lot healthier after just a couple weeks of use. Great for those of us who have the tendency to brush too hard causing gums to swell, this brush eliminates that.