A burst of acidity in the teeth may be due to severe irritation, abnormal tooth structure, pulpitis and other reasons. 1. Severe stimulation: When drinking a lot of ice-cold drinks, eating ice cream and other cold foods; eating spicy and hot foods; brushing teeth for a long time; mental stress and other physiological conditions, the nerves of the teeth are stimulated and this symptom occurs. 2. Abnormalities in tooth structure: trauma, infection, long-term wear and tear lead to partial destruction of tooth enamel or even tooth bone; failure to fill the defective part tightly during dental repair leads to exposure of dentin, and the nerve of the tooth is easily stimulated and the symptom occurs. 3. Pulpitis: bacteria and other pathogens infect the pulp tissue, causing inflammatory reaction of the pulp tissue, the nerve in the pulp is compressed and stimulated and the symptoms appear. The acidity of the teeth may be related to a variety of factors, and it is recommended to consult a doctor for a clear diagnosis.