Eating ice-cream toothache may be caused by physiological factors that make teeth sensitive to cold stimuli, or it may be caused by dental diseases, such as dental caries, periodontitis, pulpitis, and so on. 1. Physiological factors: teeth are more sensitive to cold stimulation when eating ice cream, which leads to toothache. The pain is mostly transient and can disappear on its own after removing the trigger. 2. Dental caries: Dental caries is a disease caused by bacterial infection and other factors leading to progressive destruction of dental hard tissues, which can cause tooth sensitivity, gum swelling, changes in the appearance of the teeth, oral odor and other manifestations, and therefore, cold stimulation of the teeth while eating ice cream will lead to pain. 3. Periodontitis: Periodontitis is a chronic infectious disease that occurs in the periodontal tissues, when suffering from periodontitis, patients often have symptoms such as edema of the gums, ice-cream is too cold will stimulate the periodontium and the gums, which will lead to toothache. 4. Pulpitis: Pulpitis is an inflammatory disease that occurs in the pulp of the teeth, mainly due to bacterial infection, but eating too cold food immediately after drinking a hot drink may cause the pulp to become congested, thus transforming it into pulpitis and leading to toothache. After ruling out physiological factors, patients are advised to seek timely medical treatment by the doctor for targeted treatment. Pay more attention to oral hygiene in daily life, rinse your mouth frequently, and avoid spicy, cold, hard and acidic foods.