When a child has bad breath, he or she needs to pay attention to oral hygiene, timely treatment of potential respiratory tract infections and correction of some bad habits of the child. The most common cause of bad breath is the odorous substances produced by the bacterial metabolism of food residues in the mouth. Therefore, it is extremely important to clean up these food residues after eating. For very young children, it is now possible to buy toothbrushes that children can use and then apply fluoride toothpaste to the teeth and have the parents help brush the mouth. For older children, it is necessary to help the child develop a good morning and evening brushing routine. Infections of the respiratory tract can cause bad taste in the child’s mouth. Common diseases such as tonsil infection, sinusitis and rhinitis belong to this category. Timely treatment with medication is needed to reduce the odor in children’s mouths. Some bad habits of children can also lead to bad breath. Some children like to keep sucking their fingers, like to chew some of the household items such as clothes, carpets and so on. This process may bring a lot of bacteria into the child’s mouth, aggravating the bad breath. Therefore, it is important to correct these habits of children and teach them to pay attention to hygiene and wash their hands regularly. Children with bad breath need to pay attention to cleaning. Due to their young age, children lack some proper habits, behavioral skills and cognitive abilities. Parents need to maintain great patience and give their attention.