By snacks, we mean some snack foods eaten at times other than regular meals, such as pastries, cookies, fruits, dried fruits, etc. For these things, it cannot be said in general that they are good or bad for teeth, but must be analyzed. Fruits contain a lot of vitamins, and these vitamins are good for preventing periodontal disease, oral mucosal disease and tooth decay. Fruits also contain some cellulose, which all have the effect of rubbing the surface of teeth and making them shiny. The main component of pastries, cookies and sugars is carbohydrates, and this substance is needed by the body, but it is not good to eat them as snacks often. After eating these snacks during the day, you often do not brush your teeth, so that the food residue and bacteria and saliva minerals are deposited in the teeth, and over time tartar is formed, which is easy to cause periodontal inflammation, and also easy to form dental caries. Some people like to eat nut food, in order to save time, they bite the hard shell directly with their teeth, which is easy to damage the teeth and even cause the fracture of tooth decay, so they should change this habit. We are not opposed to snacking in general, because if you are active or busy at work, you can eat some pastry food between meals, but you must pay attention to brush your teeth and rinse your mouth before going to bed.