The cause of a toothache from eating mooncakes can be caries, endodontics, wedge defects, and more. Patients are advised to go to specialized hospitals to determine the specific causes. 1. Caries: It is one of the most common causes of pain when eating sweets, and it is mostly seen in the middle or deep caries that have progressed to the dentin layer. Mooncakes contain more sugar, which will stimulate the exposed dentin to cause pain. 2. Endodontics: When caries progresses further and accumulates in the deeper layers of the pulp, patients will experience pulpal irritation and pain after eating mooncake-type sweets. 3. Wedge-shaped defects: long-term horizontal brushing or bad oral habits of patients with enamel defects in the neck of the teeth, dentin exposure to cold, hot, sour and sweet stimuli will also produce pain. Eating moon cake toothache patients are recommended to go to the hospital in time, clear causes for symptomatic treatment, so as not to miss the condition.