Smile Optics PAP+ toothpaste, contains a non-toxic, hydrogen peroxide-free whitening agent called phthalimido-peroxy-hexanoic acid (PAP), which has been proven to whiten teeth effectively. Along with its whitening properties, PAP also has anti-plaque and long-lasting anti-bacterial benefits. This specially formulated toothpaste is designed to desensitize nerves, remove stains, prevent cavities, and brighten your teeth all at once.