I'd like to warn those with sensitive teeth that this toothbrush, despite having extra soft bristles, exacerbates the problem of sensitive teeth. After using it twice a day for several days, my teeth, which are usually not too sensitive thanks to Sensodyne toothpaste, suddenly became extremely sensitive to hot and cold. Brushing also became unbearably painful, all of which subsided as soon as I went back to using my regular toothbrush. The company unfortunately would not issue a refund. If there had been a warning on the packaging regarding this issue, I would not have purchased the product. Buyer beware.