Features: Multifunctional: Whether you are dealing with stubborn stains, yellowing, or just want a brighter boost, a quick daily application helps you smile with confidences. Powerful: The advanced formulas breaks down years of built-up stains at the enamel level while being gentle enough for sensitive teeth. Extra Strength Cold Serum Formulas targets deep stains from coffee, wine, and more No Sensitivity, Just Brightness: Our gentle formulas is designed to be effective without causing tooth or gum sensitivity safe for daily use. Portable & Easy to Use: Compact pen design fits easily into your bag or pocket. Apply anytime, anywhere Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Net content: 2ml Size: Length: 13cm, Diameter: 1.3cm Package List: 1/2/3pcs Teeth Brightening Cold Serum Pens