After the food enters the mouth more than 50 °C, it is easy to burn the mucous membrane in the mouth, causing oral ulcers, ulceration, scalding the mucosa of the esophagus and stomach, causing esophagitis, gastritis, and even cancer.

Because of this, the World Health Organization defines hot drinks above 65 °C as 2A carcinogens.

Half of the world’s esophageal cancer comes from China. The most important reason is that the Chinese eat too hot.