Instruct: Classify a given review into positive or negative sentiment.
Query: Fabulous preventative dental care!

I used to faithfully use a manual tootbrush, tartar control toothpaste, floss, mouth rinse, and twice-a-year professional cleanings. However, I still had a few spots where my gums got tender or swollen. With the Sonicare, I noticed a difference very quickly and the trouble spots soon disappeared. My family has used Sonicare toothbrushes for years; it's the best preventative device! (Note: I use a manual toothbrush when traveling and after a few days, those trouble spots threaten to reappear. Once home, the Sonicare banishes those spots.)