Children usually start teething at 5-6 months, there are individual differences, parents teething sooner or later will also affect the child, if the child’s physical development is faster, often chewing tough food, will stimulate the growth of the length and width of the jawbone, the milk teeth can be erupted normally at about 5 months. Some children are accustomed to eating soft foods and dairy products, the eruption of milk teeth is delayed, and individual children do not erupt milk teeth until they are about one year old. After the eruption of milk teeth, the child’s chewing function is strengthened, which promotes the digestion and absorption of nutrients in food and accelerates physical development, and it is necessary to pay attention to the cleaning of erupted milk teeth to avoid caries.