The absence of bad breath immediately after taking Quad indicates that the bad breath is most likely caused by H. pylori infection, but also by the presence of other bacterial infections and inflammation in the mouth. Some patients with H. pylori infection will have bad breath, and after taking Quadruple drugs not only have antibacterial effect, but also inhibit gastric acid, which is therapeutic for patients with H. pylori infection. So there may be a situation where there is no bad breath immediately after taking Quadruple. In addition, because the quadruple drug may include antibiotics such as metronidazole, amoxicillin, clarithromycin, etc., which are effective against bacterial infections within their antibacterial spectrum, it can assist in the treatment of the presence of other bacterial infections and inflammation in the oral cavity, and in the treatment of halitosis caused by them. Halitosis patients are usually advised not to eat spicy and stimulating food, can be appropriate to eat more fresh vegetables and fruits, drink more hot water, usually also pay more attention to oral hygiene cleaning, rinse your mouth in time after eating, every morning and evening to brush your teeth once. Drugs need to be used under the guidance of a doctor, not blindly self-medication, in order to avoid adverse effects.