90% of tooth enamel is made up of hydroxyapatite, and the acidic substances in the daily diet can easily lead to demineralization and tooth decay. This product innovatively uses nano-hydroxyapatite, which gently rubs without hurting the gums, while continuously releasing calcium ions to rebuild the mineral barrier. Hydroxyapatite toothpaste uses a gentle formula designed to protect and repair tooth. It can effectively help restore and strengthen tooth enamel, protect your teeth from daily wear, release calcium ions to rebuild the mineral barrier, reduce the risk of tooth decay and corrosion, and promote long-term oral health. It is an ideal choice for people with sensitive teeth. The fluoride-free provides a safe alternative for oral care. Use in the morning: decompose nighttime plaque and prevent tartar formation Use at night: repair daytime tooth micro-damage and reduce 60% of molar loss Specification： Material：Niacinamide Toothpaste Weight：100g Packaging Details： 2PCS*Niacinamide Toothpaste Notes: 1. Please allow 1-3cm errors due to manual measurement. 2. Due to the difference in monitors and lighting, there may be slight differences between the product's picture and actual color. Thanks for your understanding！