Toothpaste is an auxiliary product used to increase the friction between teeth and toothbrush, thereby enhancing the cleaning ability of the toothbrush. There are reports that too much toothpaste may induce oral cancer. Because some toothpastes contain the chemical substance “sodium lauryl sulfate”, it may cause gastrointestinal diseases and liver poisoning, making the oral cavity more prone to ulcers and even oral cancer. In fact, sodium lauryl sulfate is a foaming agent and cleaning agent, not the main component of toothpaste. Unless it is the main food of toothpaste every day, it will not cause harm. No one has ever suffered from cancer because of brushing teeth. This is certain. The role of toothpaste is already very clear-increase friction, so squeezing too much toothpaste will only be wasted, neither whitening the teeth nor causing any impact. Of course this is for adults, but too much toothpaste for children is harmful. In early childhood (0-8 years old), if excessive intake of fluoride, it will cause a special disease: dental fluorosis, resulting in yellowing and corrosion of teeth. Severe can cause kidney poisoning, gastrointestinal upset, and even affect the brain development of adolescents. Children must control the amount of toothpaste when using toothpaste, generally the size of rice grains, and press the toothpaste into the toothbrush to minimize swallowing as much as possible. In fact, the care of teeth is not about how much toothpaste and expensive toothbrushes and dental floss are used, but about active oral care awareness, correct brushing methods and the habit of regularly checking the oral cavity, so that these teeth will naturally be healthy and bright Bright.