5-year-old children get up in the morning with a very smelly mouth, may be related to food residues and other physiological reasons, there may be oral diseases, stomach diseases and other pathological reasons related to the need for targeted treatment after a clear cause, parents should avoid unauthorized use of drugs for 5-year-old children, so as not to cause the situation of a very smelly mouth aggravated. A, physiological reasons: If a 5-year-old child did not rinse his mouth or brush his teeth after eating the night before, it will lead to the accumulation of food between the teeth, after a night of fermentation, can appear 5-year-old children wake up in the morning mouth very smelly situation, it is recommended that parents should urge 5-year-old children to brush their teeth after meals or before bed. Second, the pathological reasons: 1, oral diseases: due to dental plaque and tartar deposits on the surface of the teeth, may also lead to 5-year-old children get up in the morning mouth very smelly phenomenon, at this time can be ultrasonic dental cleaning, not only to remove foreign bodies on the teeth, but also very good to improve the mouth very smelly phenomenon; 2, stomach diseases: such as 5-year-old children infected with Helicobacter pylori, etc., due to the decline in gastric digestive function, food accumulation in the 5-year-old children should actively treat gastric diseases, can improve the situation of the mouth very smelly, when the Helicobacter pylori is completely eliminated, the symptoms of the mouth very smelly will gradually disappear; 3, other diseases: may also be related to rhinitis and other causes, if 5-year-old children suffer from rhinitis, nasal secretions backward into the nasopharynx, that is The phenomenon of nasal leakage can trigger the nasopharyngitis syndrome, which may appear in the morning to wake up with a very smelly mouth, if necessary, you can follow medical advice to give budesonide aerosol, mometasone furoate nasal spray and other drugs for nasal spray, in the relief of the original disease, the symptoms will also be relieved.