The LINHART Tooth Whitener Gel is the perfect supplement to your everyday toothpaste. It offers an effective, stable, and easy to use tooth whitening formula. Hydrogen Peroxide, the active ingredient, helps to safely whiten teeth, while most toothpastes with whitening benefits use harmful abrasives that irrevocably damage tooth enamel. Simple To Use, just add a drop to your toothpaste regularly when you brush until the desired shade is achieved.