The treatment of bad breath in the elderly is as follows: 1. It is recommended to carry out relevant examinations, including oral examination, to clarify whether there is periodontitis, periodontal disease, dental caries; nasal examination, to clarify whether there is septic sinusitis; some of the elderly may have acute and chronic tonsillitis, bronchitis, pneumonia, reflux esophagitis and Helicobacter pylori infection. If the elderly often have a foul taste in the mouth, it is recommended to go to the regular hospital as soon as possible to improve the oral system, digestive system and respiratory system, etc., to control the above diseases, which can alleviate the symptoms; 2. If there is no such disease, the following treatments should be carried out: (1) maintain a regular routine of life and work and stable emotions; (2) quit smoking, alcohol, and eat less garlic; (3) don’t overeat, drink plenty of water, and eat more vegetables and fruits; (4) Insist on brushing your teeth in the morning and evening, rinse your mouth with lightly salted water after meals, and use a toothpick or dental floss to remove the food in the gap between your teeth; (5) take down your dentures after meals and rinse them out, and put them in clean water so as not to contaminate the dentures. In general, through the above treatment, the elderly bad breath will gradually relieve.