Instruct: Classify an Amazon review as either positive or negative.
Query: A big difference for your teeth

I used to laugh at friends who told me about their electric toothbrushes, figuring they were just lazy to use regular ones. When I got the sonicare toothbrush, I was amazed at how well and thoroughly it cleaned my teeth. Plus, the timer helps ensure you do a thorough cleaning rather than just brush for a couple of seconds.