It is suggested to fill the teeth as soon as possible, and the earlier the effect, the better. When your teeth are fixed, you won't be afraid to eat sugar if you have a toothache. Sugar-free candy is not sugar-free, but has a low sugar content. At present, some reports over-publicize the role of xylitol in chewing gum, which makes consumers mistakenly think that the higher the xylitol content, the better the caries prevention effect. In fact, xylitol is only a widely used sugar substitute, and the tooth protection function of sugar-free chewing gum containing xylitol mainly comes from saliva. Xylitol, as a sweetener of sugarless chewing gum, will not be fermented by cariogenic microorganisms to produce acidic substances, so it will not corrode teeth. Chewing sugar-free gum can increase the flow of saliva, neutralize the acidic substances in the mouth, and its rich minerals can also help the remineralization of teeth and participate in the early restoration of small dental caries. A large number of clinical trials abroad show that the content of xylitol in chewing gum does not affect the caries prevention effect. For example, a two-year clinical trial conducted by Candeman Company in Canada showed that there was no difference in caries prevention effect between sugar-free chewing gum with xylitol content of 15% and 65%. Therefore, when consumers choose chewing gum, xylitol content should not be the main factor. In addition, excessive intake of xylitol can also cause health problems, such as diarrhea and obesity. Although the content of xylitol in chewing gum is small, it will basically not affect the human body. In Europe and America, generally foods containing xylitol will be labeled with consumption tips such as "excessive intake may lead to diarrhea". Experts remind that there are three misunderstandings in the consumption of xylitol at present: First, it can repair cavities. Some manufacturers claim that their xylitol chewing gum can not only prevent tooth decay, but also repair tooth decay. In this regard, experts said that xylitol has a certain effect on preventing tooth decay, but it cannot repair tooth decay. At most, people who eat xylitol regularly are less likely to suffer from tooth decay than those who eat sucrose regularly. Second, the higher the content, the better the caries prevention effect. Experts say that the content of xylitol in chewing gum does not affect the caries prevention effect; Third, it can completely replace sugar. In fact, xylitol, like glucose and sucrose, is a carbohydrate composed of carbon, hydrogen and oxygen. Therefore, diabetic patients should not eat more xylitol, which is a natural plant sweetener extracted from birch, oak and other plants. At present, the xylitol chewing gum and other products sold in China generally contain about 0.4g ~ 0.5g of xylitol per tablet. You have to take 100 to 120 tablets to get 50 grams of xylitol, so you don't have to worry too much about dental care after eating candy.