Generally speaking, babies can start learning to rinse their mouths at 20 months of age. Parents can guide their babies to open their mouths and look in the mirror after meals, or to look at each other’s teeth with their parents, so that they can see the food residues in their teeth and mouths. At this time, you can let your baby imitate the mouthwash action for this stage of the baby’s good imitation characteristics. Young children should learn to brush their teeth from the age of 3. At first, you can let your child practice the “twist and turn” action with a toothbrush in hand. Before learning to brush teeth, be careful not to let your child use children’s toothpaste first, in case he or she smells toothpaste that he or she doesn’t like and doesn’t want to learn how to brush teeth. It is worth reminding that it is best to use warm water when children brush their teeth because it can minimize the stimulation of hot and cold, protect the teeth and reduce the occurrence of dental disease, especially for young children suffering from dental allergies, tooth decay, periodontitis, mouth ulcers, tongue inflammation, pharyngitis, and can play a more protective role. Learning to brush teeth carefully from childhood has a vital impact on the oral and even general health of a person’s whole life, and the effect of cultivating children’s enthusiasm for brushing teeth is far better than a serious order to urge. In clinical practice, many babies with caries often have parents who do not pay much attention to oral health or are too demanding. “Many young children don’t brush their teeth, and only a few brush once in the morning. Instead, they are likely to still be eating snacks and drinking milk before bedtime.” In this case, it’s hard for a child to keep from developing caries. For babies who can’t brush their teeth, it is also necessary for parents to help brush their teeth. Parents can use a finger toothbrush or wrap hygienic gauze around their fingers and brush your baby’s teeth with water or light salt water after feeding. It is worth to be alerted to another type of parents who are very strict with their children, requiring them to brush their teeth carefully one by one at a young age, and criticize them severely if they do not brush properly, resulting in a heavy burden on the child’s mind that brushing teeth is a painful thing, so that in the absence of parents, they can avoid it, or even just wet the toothbrush and cup, perfunctorily.