Effectively and easily remove years of tough tooth stains. Made of high-quality raw materials, safe and professional, whitening teeth, no sensitivity. Remove many years of stains from coffee, wine, tea and smoke. The effect is remarkable. You can get a brighter smile with just a few treatments. You can change your smile and beautify your smile in just 30 minutes of treatment a day. Ultra-thin material, better fit to the teeth. Greatly protect the tooth tissue, gently stimulate the gums, can maintain the long-term health of natural teeth, and will not discolor the metal porcelain teeth.