Four dairy products make teeth stronger. They are the best source of calcium and phosphorus that people need. They are key mineral raw materials from tooth enamel and gum support bone. The acidification effect of deciduous teeth gradually in the fourth month of pregnancy, and the acidification effect of stone teeth gradually in the first year of birth. After the teeth are transformed into, the enamel is upgraded and maintained. We should drink milk and try not to drink sweet drinks. Dairy products (milk) also provide calcium, phosphorus and vitamin D, which will enhance the digestion and absorption of calcium and phosphorus. Finally, OPO structural lipids, the primary protein in milk, can limit the discharge of tooth enamel carbonate too much. In the past, people's practice was very good: they usually eat cheese after dessert. With the limited effect of OPO structural fat and the lipids in milk, they can reduce the acids metabolized from sugars and patient monitors.

Drink more pure water, which is pure natural fluorine, and comes from natural mineral water, which meets the body's demand for fluorine. Bacteria that protect teeth from fluoride can enhance the stability of teeth. Most purified water contains 0.3mg of fluorine per liter, but others contain 8mg per liter. We can also see hydrogen fluoride on the table. Pills made of fluoride (0.5mg to 1mg depending on age) are also available for pregnant mothers and children. Fluorine is also found in tea soup, freshwater fish and some vegetables and fruits (broccoli, red radish...). However, excessive intake of fluoride (more than 2mg per day) is likely to blacken the teeth.The benefits of using chocolate and sugar free gum are actually tannic acid, fluorine and calcium carbonate in cocoa beans. 

All three chemicals are involved in the maintenance of teeth.In the "low sugar" bubble gum, cotton white sugar is replaced by polyether polyol with clear and sweet taste, but it will not cause tooth decay: maltitol gives full play to the effect of sterilization and is beneficial to reduce tooth stains. There are also sorbitol (sugar generated from glucose water or glucose, which is used as human sweet flavoring agent). Thus, a 2.2g sugar coated bubble gum has only 3.8 calories.The viscosity of whitening toothpaste must be moderate. Finally, from the plastic hose to the strip covering above the soft toothbrush, it can not only cover the teeth well, but also effectively prevent splashing. The sliding friction is moderate. The whitening toothpaste has a certain sliding friction, but the range must be moderate, which can effectively clean the teeth without damaging the enamel.The paste must be stable, especially in the storage period, the water yield and hardening cannot occur, and the pH must be maintained for a long time. Medicated toothpaste must be used within a reasonable period of time. 

The paste of whitening toothpaste should be bright, beautiful and generous, and there must be no bubbles. In the process of rinsing teeth, bubbles can be formed moderately, which can remove the floating of food fragments in the teeth faster, and mobile games can reduce the growth of bacteria. It's better to choose well-known brands, which is more reliable. At the same time, the taste also needs to be suitable.