Bad breath can be treated with drugs such as omeprazole, or treatment measures such as ultrasonic scaling, 3% hydrogen peroxide solution to rinse cavities and adjust the high point of profile, as follows: 1.Omeprazole and other drugs: When suffering from gastric ulcer, duodenal ulcer and other diseases, food indigestion, belching, acid reflux and other symptoms, you can apply omeprazole and other drugs to treat digestive tract diseases. 2.Ultrasonic scaling: When the cervical part of the tooth is covered with a large amount of calculus, stimulating the swelling of gum and oozing blood, ultrasonic scaling and subgingival scraping can be carried out to completely remove the calculus and granulation tissue to reduce bad breath. 3.3% hydrogen peroxide solution rinsing cavity: when deep cavity is formed in the crown of the tooth and the embedded food residue gives out sour smell, 3% hydrogen peroxide solution can be applied to rinse the cavity, and after grinding out the decay, use composite resin and other filling. 4. Adjusting and grinding the high point of shape: when the food fiber is often embedded between two teeth and causes bad breath, you can adjust and grind the high point of shape to extend the abduction gap to facilitate food discharge, and make inlay restoration if necessary.