Bad breath is relatively common in normal daily life and can be reduced by improving oral hygiene, treating oral diseases and maintaining some good habits. Maintaining good oral hygiene plays a vital role in dealing with bad breath. Brush your teeth twice a day with fluoride toothpaste to remove food debris and plaque. You should also brush and scrub your tongue along with your teeth. Replace your toothbrush every 2 to 3 months or after an illness. Use dental floss or interdental cleaner once a day to remove food debris and plaque from between the teeth. Rinse with an antibacterial mouthwash twice a day. For those who wear dentures, remove and thoroughly clean them at night and then place them in the mouth the next morning. These measures can be effective in maintaining oral hygiene and reducing the growth of bacteria. For people who have various oral diseases themselves, such as caries and periodontal disease, they should be treated as early as possible and be followed up at least twice a year. By performing oral examinations and professional dental cleanings, periodontal diseases can be checked and treated. Bad breath can be reduced by effectively treating diseases of the teeth and gums. There are some systemic diseases such as those of the digestive system, respiratory system, and blood system that can also cause bad breath. It is recommended that a comprehensive examination and treatment of the corresponding diseases at a general hospital will reduce the symptoms of bad breath. Dry mouth can easily lead to the breeding of bacteria, resulting in bad breath. Usually you can drink more water in your life to maintain a moist environment in your mouth. Usually you can chew some sugar-free gum, which can also help the salivary glands to secrete saliva and keep the mouth moist. For people with serious bad breath problems, they should try to avoid drinking alcohol and smoking. Some foods can give off abnormal odors that cause bad breath and should usually be noted in the diet. Foods such as onion and garlic can cause abnormal bad breath and should be avoided or reduced. Bad breath is relatively common. It can be effectively reduced through effective treatment of oral diseases and some improvements in hygiene habits in daily life, or treatment of systemic diseases.