Bad breath in children may be caused by inattention to oral hygiene, oral diseases, respiratory tract infections and indigestion, etc. Treatment generally requires individualized treatment according to the specific cause. First, physiological factors children in the case of inattention to oral hygiene, will lead to the presence of food residues in the mouth, plaque collection, or microbial production, these conditions may induce bad breath. For such children, they should pay attention to rinse their mouth after eating and develop good brushing habits. In addition, for children with dental plaque and microorganisms in the oral cavity, they also need to be professionally treated under the guidance of a doctor for plaque and microorganisms. Pathological factors 1, oral diseases: For children with gingivitis, tooth decay, dental caries, radiculitis, pulpitis, noma, ulcerative stomatitis and other oral diseases, the influence of corrosive food or inflammatory secretions left in the bad teeth may also trigger bad breath in children. At this time, oral glucocorticoids, antibiotics and other drugs under medical supervision, or extraction of bad teeth to the treatment of oral diseases, and thus alleviate the bad breath; 2, respiratory tract infection: when pharyngitis, sinusitis and tonsillitis, due to bacterial infection and inflammatory stimulation, may also cause bad breath in children, at this time can be under the guidance of doctors for anti-inflammatory, anti-infective treatment, but also nebulization 3, indigestion: if the child itself exists gastrointestinal tract diseases, usually accompanied by disorders of the flora or weak gastrointestinal tract function. The food in the stomach is often not fully digested, resulting in a long stay in the stomach, constantly fermenting and producing foul-smelling compound gas, which in turn causes bad breath. In this case, under the guidance of a doctor, children can be given a moderate amount of probiotics to help digestion. In addition to the above factors, children with fire or liver and gallbladder lesions may also cause bad breath, and cannot be cited individually. When children have bad breath, they should seek medical treatment as soon as possible to avoid any adverse consequences.