The process of caries development requires the participation of food. Sugar in food is the main culprit of caries. On the one hand, sugar provides energy source for the metabolism of bacteria. On the other hand, sugar is used by bacteria to produce acid. Both the epidemiological survey of the population and the experimental observation of animals have fully proved that sugars play a decisive role in the process of caries development. However, as a source of energy, sugar is one of the important substances that are indispensable for human body. Therefore, it is very important to develop good dietary habits for the prevention of caries. The first thing is to reduce the intake of caries-causing food. The so-called caries-causing food is sticky fermented food, such as candy and pastry, dried fruit, sugar-containing drinks, autumn pear cream, honey and so on. After entering into the mouth, these foods are easy to adhere to the tooth surface and not easy to be removed from the mouth, and can be used by bacteria to produce acid for a long time. The intake of self-cleaning food is good for the control of dental plaque. For example, fresh vegetables or fruits and other foods that contain a lot of fiber. There are also milk and soy products, which are rich in protein and lipids and have a protective effect on the tooth surface. Reasonable arrangement of eating frequency and eating order. After the cariogenic food comes into contact with the plaque, it produces the acid to destroy the teeth for 30 minutes, if you eat sugar 5 times a day, it will be 150 minutes, and the risk of caries is obviously increased. In addition, if the self-cleaning food (such as apple) is arranged in the caries-causing food (such as cake), it is beneficial to reduce the residence time of the latter in the mouth and achieve the effect of caries prevention. Choose sugar substitutes. Sweeteners that do not produce acid in the plaque are used to replace sucrose. The commonly used ones are sorbitol and xylitol, etc. The anti-caries chewing gum on the market uses this kind of substance. But at present, sugar substitutes still have insufficient calories, various side effects, and some may cause cancer (such as saccharin), etc. From the point of view of caries prevention, especially for children, the easier way is to replace sugar with foods like fruits.