Whitening Pen - Removes Tooth Discoloration, Brush Type, Whitens Teeth, Tooth Whitening (2 White Pens) [Pen-Type Whitening] Easy to apply! No troublesome sheets needed. [For those who] Are concerned about yellowing teeth? Those worried about nicotine stains, those who want to whiten their teeth easily at home. [Effective Usage] Use twice a day for 2 weeks or more.