Depending on the cause of the acidity in the mouth, you can take Baohe Pills, Citrus Aurantium Pills and Spleen Enhancement Pills. The main cause of acidity in the mouth is injured food or heat in the liver and stomach. Sour taste in the mouth is caused by overeating, food accumulation (accumulation of poorly digested food in the stomach) in the stomach and epigastric region, and sourness in the mouth due to corrosive food. Depending on the specific symptoms, Baohe Pills, Hovenia Conducting Pills, Spleen Enhancement Pills, etc. can be used. If there is accumulation of food and heat, Baohe Pills can be taken; if there is accumulation of food with dry stools and accumulation of dampness and heat (the dampness and heat evils accumulate with each other in the body), Citrus Aurantium Pill can be taken; and if there is weakness of the spleen and stomach leading to accumulation of food, Spleen Strengthening Pill can be used. Liver depression and transforming heat into stomach can also lead to acid vomiting, use Artemisia Scutellaria Clearing Gallbladder Soup, Huanglian Warm Gallbladder Soup and so on. If acid vomiting is accompanied by bitter taste in the mouth, distention and fullness in the abdomen and ribs, and hiccups, Artemisia Scutellaria Clearing the Gallbladder Tang can be used. If acid in the mouth is accompanied by nausea and vomiting, and bitter taste in the mouth and dryness in the throat, Huanglian Warming the Gallbladder Tang can be used. If acidity in the mouth is accompanied by other symptoms, consult a doctor and use medication under the guidance of a physician.