Nutritional effect: the matrix of chewing gum is very sticky. Through chewing exercise and mechanical stimulation, food residue on tooth surface can be removed, saliva secretion can be increased, and oral surface can be washed, which has a certain cleaning effect on oral cavity. Chewing gum promotes facial blood circulation and muscle exercise, and promotes the development of teeth and maxillofacial region. When chewing gum, saliva secretion increases, which can promote digestion. The fittest is like this: most people can eat it. Children should not eat more. Every time 1. No more than 2 yuan in a day. Special instructions: saccharin, pigment, perfume, antioxidant, etc. When it is added to chewing gum, it can form highly viscous water-insoluble polysaccharide under the action of bacteria, adhere to the tooth surface, and then form dental plaque. It will also ferment to produce acid, which will dissolve the minerals on the tooth surface and lead to dental caries. Chewing gum also contains plasticizer, which is slightly toxic. In the process of blowing bubbles, you constantly spit out your tongue, stick out your tongue, and habitually chew with one side of your teeth, which will lead to uneven maxillofacial development and dentofacial deformity. It is easy for children to swallow chewing gum into esophagus or bronchus by mistake, which will be life-threatening. Although swallowing is not recommended, xylitol chewing gum can be swallowed completely. Don't worry too much. Didn't anyone accidentally swallow gum when they were children? Most of the gum contained in chewing gum has not been digested, and most of it can be excreted with stool. In addition, you can eat some crude fiber food to stimulate intestinal peristalsis. The doctor pointed out that the inner wall of human stomach is smooth and secretes a lot of mucus. Gum can't stick. If it can't be digested after swallowing, it won't be discharged automatically without surgery. But in order to avoid accidents, it is best not to give children chewing gum, because it is not only useless, but also troublesome if swallowed by mistake. In addition, if children chew gum all the time, they will swallow too much air because of chewing gum. ● Is chewing gum beneficial or harmful to teeth? Medical experts do not advocate chewing gum as a fashion, especially chewing gum too much and for too long may have adverse effects on health. First of all, most chewing gum is sweetened with sucrose. When chewing gum, sugar stays in the mouth for a long time. Cariogenic bacteria in the mouth will use sucrose to produce acidic substances, which will corrode teeth and decalcify them, thus inducing dental caries. Secondly, people who have filled their teeth with mercury-containing materials had better not chew gum. A study by Swiss scientists found that chewing gum often destroys the substances used to fill teeth in the mouth and releases amalgam, which leads to excessive mercury content in blood and urine, thus causing harm to the brain, central nervous system and kidneys. Besides, chewing gum is not good for children. Because the child's self-control ability is poor, if he keeps chewing gum in his mouth all day, he may be swallowed or mistakenly entered into the trachea, which is life-threatening. Chewing gum for a long time, the masticatory muscles are always in a state of tension, which may develop the habit of grinding teeth during sleep, thus affecting the quality of children's sleep. Doctors suggest that chewing gum should not last more than 15 minutes, and people with stomach problems should not chew gum too much, because chewing gum for a long time will reflexively secrete a lot of gastric acid, which will not only cause symptoms such as fasting nausea, loss of appetite, acid reflux, etc., but also lead to diseases such as gastric ulcer and gastritis for a long time. Many gastrointestinal experts believe that chewing gum on an empty stomach can cause nausea, dizziness and other adverse reactions, which are easy to cause gastritis and gastric ulcer; Don't chew gum for more than 20 minutes after meals. Otherwise, the digestive juice secreted when chewing gum will damage the gastric mucosa. Pediatric neurologists believe that the chewing muscles of children who like chewing gum are always in a "tense state". Children should chew gum no more than 3-4 times a day and chew for no more than 10- 15 minutes after each meal. Never put gum in your mouth all day. The longer the time, the greater the harm. This is also one of the reasons why children can't sleep well when grinding their teeth. Stomatologists, gastrointestinal experts and pediatric experts agree that children before the age of 3 and children with gastritis, duodenitis, gastric ulcer and duodenal ulcer should not chew gum. In addition, the extract contained in chewing gum may have an allergic reaction with drugs, and children with serious infectious diseases should not chew chewing gum. Some people think that chewing gum can prevent caries, while others think that chewing gum can prevent caries. So is chewing gum beneficial or harmful to oral health? We should analyze it realistically and concretely. (1) The benefits of chewing gum to oral health should be analyzed from its two characteristics. First of all, chewing gum needs to be chewed continuously in the mouth, which is beneficial to oral health: ① Chewing can stimulate saliva secretion, and combined with the friction effect of chewing gum on teeth, it can enhance the cleaning effect of teeth, reduce caries-causing factors and help prevent caries. ② Regular chewing exercise is beneficial to periodontal health and even to beauty. According to the survey data, some actors and singers often exercise their faces, and the occurrence of facial senile plaques is at least 8 to 10 years later than that of ordinary people. Fox, director of the Los Angeles Neurology Medical Center, found that chewing gum for 15 ~ 20 minutes every day would be helpful for beauty. If it lasts for several weeks, it will also reduce facial wrinkles and gradually become rosy. This is because chewing promotes facial muscle movement, improves blood circulation and improves the metabolic activity of skin cells. Therefore, some scientists advocate regular chewing exercise, especially in the daily diet, we should eat more coarse grains and foods rich in fiber with appropriate hardness, chew slowly, which is not only conducive to the absorption of nutrients, the cleaning of teeth, but also conducive to the promotion of facial muscle movement. Secondly, chewing gum is characterized by a "fragrant" word. Incense can improve people's interest in chewing, and can also temporarily improve the bad smell in the mouth, which makes people feel refreshed and comfortable, and is also conducive to social activities. (2) If chewing gum is harmful to oral health, the key lies in the word "sugar", because sugar is one of the important factors of dental caries, while chewing gum, sugar stays in the mouth for a long time. What do we do? At present, the development of science and technology has found a substitute for sugar, xylitol or stevia. This can not only satisfy people's enjoyment of sweetness, but also achieve the purpose of reducing dental caries. Another problem is that many children and teenagers like to blow bubbles with chewing gum. If you continue to blow bubbles frequently, it may make the front teeth move outward and affect the appearance. How to remove chewing gum from clothes? 1 Apply it with egg white where there is chewing gum ~ rub it, and put it in the refrigerator for 2 hours. Spread a piece of white paper on the sticky part of the chewing gum, then iron it with an electric iron for two or three minutes, and the chewing gum stuck on the clothes will be transferred to the white paper.