Causes and treatments of eating teeth acid are mainly the following: First, dental caries, dental caries can cause demineralization and defects in the dental tissues, once the caries develops to the dentin there will be sensitivity to sweet and sour. Symptoms of eating sour teeth, it will be found that there are black holes in the teeth, some holes are very hidden, not easy to detect, so the teeth sour to timely medical treatment, treatment is to completely remove the decay of the tooth tissue, and then fill the cavity with resin materials can be. Second, suffering from periodontitis, periodontitis is a chronic inflammation of the periodontium caused by tartar and plaque, which will lead to alveolar bone resorption, gum recession, root exposure, which will cause the teeth to be sensitive to cold, hot, sour and sweet, resulting in the sensation of eating sour teeth. The treatment is ultrasonic scaling and periodontal scraping to remove tartar and other sources of infection, which can stop the exposure of tooth roots, while you can brush your teeth with desensitizing toothpaste or go to the hospital for desensitizing treatment. Thirdly, abrasion, abrasion will lead to dental defects, which in turn will cause acidity when eating, and can be treated by desensitization or crown wrapping.