The Chinese idiom of “to have syrupy grandchildren” is a beautiful idiom to describe the joy of family life between grandchildren. However, in today’s cultural and scientific prosperity and health knowledge, dentistry experts will tell you that: “Toiling with grandchildren is not a good oral hygiene behavior, it may cause your baby to have dental caries in the mouth in the future. Caries is a kind of bacterial infection disease, the toothless mouth of newborn baby does not exist caries-causing bacteria, from about half an age, the baby starts to teething; at the age of two, the milk teeth grow in succession. At this stage, it is necessary to prevent the infection by cariogenic bacteria, and the source of bacterial infection often comes from the child’s mother, grandparents and other family members who are responsible for feeding. Many family feeders, especially the older ones, like to chew the food and feed the child, try the temperature of the child’s food with their mouths, or blow the child’s diet with their mouths to cool it, all these behaviors will cause the exchange of saliva between adults and infants, which will cause the spread of caries-causing bacteria. Therefore, it is unhygienic to feed the child by tasting and testing the food. During the period of susceptibility from the beginning of baby’s tooth eruption to about one year after the milk teeth are fully grown, if the caries-causing bacteria infection can be effectively avoided, the caries-causing bacteria will not be easily colonized in the oral cavity in the future, and once the early infection occurs, the caries-causing bacteria will exist in the tooth surface and oral cavity as the dominant bacterial species for the whole life of the child, which is difficult to be completely removed and induced to form caries with the participation of other factors. It has been confirmed that the earlier the caries-causing bacteria colonize and multiply in the mouth of children, the more serious the caries will be in the future. Therefore, it is important to delay the onset of infection as much as possible to reduce the severity of caries in children in the future. In order to reduce the transmission of caries-causing bacteria between feeders and infants, dentistry experts recommend the following: 1. The mother who is suffering from caries has more caries-causing bacteria in her mouth, so the child may also be infected with caries-causing bacteria earlier and cause tooth decay. If tooth decay is found before or during pregnancy, it should be filled as soon as possible. This can reduce the number of cariogenic bacteria in the mouth, thus reducing the chance of spreading cariogenic bacteria to the baby. 2.Everything that enters the baby’s mouth should not enter the mother’s or other caregiver’s mouth, including food, spoon, pacifier, etc. All the baby’s dining utensils should be exclusive and should be disinfected and cleaned with attention. 3. Avoid kissing the baby’s mouth and lips directly; child care workers can chew xylitol gum to inhibit the number of cariogenic bacteria in the mouth. The use of xylitol by adults can start before the baby’s first milk tooth erupts and continue until the baby is 2.5 to 3 years old. 4.Before bottle feeding, the caregiver can put a drop of milk on the back of hand to test the temperature of milk instead of sucking the teat directly; similarly, when spoon feeding, the caregiver can also put the spoon on the back of hand to test the temperature of food, and should avoid touching the spoon or food with mouth. It is also very important to do a good job in infant feeding and oral care to prevent baby from caries, the relevant measures include: 1. “2.Milk feeding is best without sugar, regular feeding, don’t develop the bad habit of letting baby sleep with bottle; 3.Feed plain water regularly to clean the mouth before the milk teeth erupt; 4.After the first milk teeth erupt until 3 years old, the mother should help the child brush the teeth once in the morning and once in the evening; 5.Limit the amount and times of eating sweets After eating sweets, brush your teeth and rinse your mouth after drinking sweet drinks.