Sour teeth after pregnancy may be caused by acid reflux, periodontal disease, and fissured teeth. 1. Acid reflux: women may experience acid reflux and vomiting in the early stages of pregnancy. Acid reflux into the mouth may cause irritation to the teeth, resulting in the symptom of sour teeth. 2. Periodontal disease: If a woman has periodontal lesions in her mouth before pregnancy, and her physical condition and resistance deteriorate after pregnancy, and periodontal disease strikes acutely, the patient may have red, swollen and pus-filled gums and acidic teeth, and some of the patients may also suffer from bad taste and gingival hyperplasia. 3. Concealed fissure: When pregnant women have concealed fissure or obvious wedge-shaped defects, and then eat too acidic, too cold or too hot food, it may cause tooth acid. It is recommended that patients seek medical examination in time to clarify the cause of the disease and then carry out targeted treatment, pay attention to the protection of teeth in life, avoid eating too cold, too hot or stimulating food, and regular review.