Our Teeth Whitening Pen is formulated with a carefully selected blend of ingredients that ensure a gentle yet effective whitening experience. Here are the key components and their purposes: Phthalimidoperoxycaproic Acid (PAP): This active whitening ingredient is scientifically proven to safely remove stains and discoloration from the tooth surface without causing sensitivity or enamel damage. Hydroxyapatite (nHA): A naturally occurring mineral and the main component of teeth. Our Advanced PAP formula contains a nano-synthetic version that strengthens and remineralises damaged enamel, reducing tooth sensitivity, periodontitis, and oral bacteria. PVP (Polyvinylpyrrolidone): This protective ingredient helps to prevent the buildup of stains on the tooth surface, ensuring long-lasting whitening results. The full list of ingredients in our Teeth Whitening Pen is as follows: Aqua, Phthalimidoperoxycaproic Acid, Propylene Glycol, Glycerol, Xanthan Gum, PVP, Hydroxyapatite, Tetrasodium pyrophosphate, Sodium Saccharin, Menthol, Mentha Viridis Leaf Oil, Mica, Disodium EDTA. Unlike competing products, these ingredients comply with UK, EU, and US regulations and are formulated to deliver a gentle and effective teeth whitening experience.