Lactic acid bacteria drinks Lactic acid bacteria drinks are fermented milk drinks, which contain bacteria of the genus Lactobacillus, which can break down glucose or lactose to produce lactic acid. Lactobacilli are probiotics and are beneficial to health when consumed in moderation. But at the same time, we should also see that firstly, the metabolite of lactic acid bacteria itself is lactic acid; secondly, the PH value of lactic acid bacteria drink itself is low (3.3-3.9), and it is worth noting that the critical PH value of enamel demineralization is 5.4~5.5; thirdly, the sugar content in the drink is high, about 12%, and it is sucrose that can be used by cariogenic bacteria. In addition, some animal studies have shown that some bacteria in lactic acid bacteria can induce the production of dental caries. All the above are typical caries-causing factors, so long-term consumption of lactobacillus beverage is not good for dental health and may lead to high incidence of dental caries. Potato chips are an important part of snacks in people’s life, usually made of potatoes sliced and fried, and then prepared. Studies have shown that potato chips can cause obesity, skin diseases, and even cancer, which is a serious health risk to humans. In addition, there are also studies that show that potato chips can even stay on people’s teeth longer than some well-known high-sugar snacks, and the starch it contains is broken down by enzymes in saliva to produce 94% of the sugar, maltose and maltose trisaccharide, fried bagels, peanut cookies, salty crackers of similar data for 43%, 51%, 61%. And in the list of caries-causing ability of sugar, maltose is second only to sucrose and glucose. Therefore, potato chips may be more likely to cause dental caries than other snacks. Chewing gum is made of natural gum or glycerin resin as the base gum, adding syrup (powder), mint, sweetener and so on and pressing it. Modern people like to chew chewing gum for various reasons: refreshing the mind, freshening the breath, exercising the facial muscles and so on. However, most of the added saccharin in chewing gum is sucrose, which is considered by researchers as “the first culprit of caries development”, especially people usually chew gum for a long time, which may increase the chance of dental caries. In recent years, there are chewing gum with xylitol, which is not easily used by bacteria in the mouth and can avoid the above risk.