There are two sets of teeth in a person’s life, namely, milk teeth and permanent teeth, and many parents think that milk teeth will be replaced anyway, so they do not go for treatment. In fact, this approach is totally wrong. “Six-year-old teeth” are also mistaken as milk teeth by many parents and ignored, which leads to serious consequences. Tooth decay has adverse effects on children’s oral cavity and body. It affects the chewing function, the health of permanent teeth, the eruption time, order and position of permanent teeth, easily damages the oral mucous membrane tissue, also affects the nutritional intake of children, correct pronunciation, and also causes some depression to children psychologically, and if it develops into chronic periapical infection, it will also affect other tissues of the organism. Therefore, children’s caries should attract parents’ attention and should be filled and treated in time once it is found. The so-called “six-age teeth” are the first permanent molars, which are the earliest teeth erupting in our mouth, generally erupting behind the milk teeth at the age of six, without replacing any milk teeth. Therefore, it is especially important to prevent it from caries. Children’s caries should not only attract attention after it occurs, but we should do prevention to minimize the possibility of caries. 1.Master the correct method of brushing teeth. Parents should educate their children to form the good habit of brushing teeth in the morning and evening and rinsing mouth after meals, and to master the correct brushing method. Many parents only pay attention to let their children brush their teeth in the morning, neglecting to brush their teeth at night. In fact, brushing teeth at night is more important than brushing teeth in the morning. Because the mouth is in a quiescent state after going to sleep, saliva secretion is reduced, the lack of flushing effect, food residues remain in the mouth, pathogenic microorganisms grow and multiply. Brushing teeth before going to bed can brush away the food residue and bacteria, so that the mouth is in a clean state for a long time, which is necessary for the prevention of tooth decay. Parents should choose the right toothpaste and toothbrush for their children. Fluoride toothpaste has anti-caries effect, and the effect is better for children, which has been recognized by scholars in various countries. The bristles of toothbrush should not be too long, short bristles should be used, which is more convenient and stable when operating. The correct way to brush teeth is vertical brushing method, that is, brush teeth along the long axis of teeth, put the bristle end of toothbrush horizontally on the tooth surface, press the bristle slightly along the gum, then turn the handle of toothbrush, brush the upper teeth from top to bottom, brush the lower teeth from bottom to top, repeatedly, about 3 minutes. 2.Parents do not overload their children with sucrose, and should control the number and amount of snacks and snacks, and should also pay attention to the problems of partial eating and one-sided chewing. 3.To achieve regular check-ups, parents should take their children for check-ups every 3 months in order to receive timely preventive and curative measures. 4.Coating fluoride on the tooth surface not only promotes the remineralization of caries, but also can inhibit and prevent the occurrence of caries. 5.The sulcus closure of the sulcus on the tooth surface of the milk molar and permanent molar and the sulcus on the buccal and lingual surfaces, which are more prone to caries, can play a better role in preventing caries. The best time for sealing is: the milk molar is 3-4 years old, the first permanent molar is 6-7 years old, the second permanent molar is 11-13 years old, and the bicuspid is 9-13 years old. For children with disabilities who have poor oral hygiene, although they are older or have had teeth erupting from the oral cavity for a longer period of time, they may consider relaxing the age of fossa closure. Closure is simple and can be accomplished in a few steps by cleaning the teeth, acid etching, rinsing and drying, applying the sealant and curing. After curing, the material is tightly bonded to the wall of the sulcus and has a certain resistance to chewing pressure, which is not a hindrance to eating; moreover, the material is non-toxic and harmless to humans after curing. However, it needs to be checked periodically and needs to be resealed if the material falls off. During the growth and development period of children, the good or bad teeth can affect the whole body health and facial development. Therefore, it is extremely important to pay attention to oral hygiene and prevent children’s caries.