Use this teeth whitening pen continuously to whiten your teeth by 4 to 8 shades, remove black and yellow teeth. Teeth whitening pens gently and effectively remove years of stubborn stains. - Rotating design with soft brush head for a complete whitening experience - Easy to use at home or on the go - Quick results in just 1 minute of daily use - Ideal for treating stubborn stains caused by coffee, tea, wine, and tobacco