Eating toothache is not necessarily hurt the nerve, but also may be caries, wisdom teeth, pericoronitis or gingival papillitis caused by the specific situation is analyzed as follows: 1. Dental caries: If the caries is more serious, the lesion is deep to the dentin. When hot or cold food enters the cavity, irritation pain and other discomfort will occur. 2. Wisdom tooth pericoronitis: If there is wisdom tooth pericoronitis, it will also cause toothache when eating when inflammation occurs, the inflammation is usually related to the gum tissue stimulation by dental calculus or bacterial infection, usually need to be treated with active anti-infection treatment before considering whether to extract the tooth. 3. Gingivopapillitis: The main manifestation of gingivopapillitis is the pain and edema of the gum tissues, so it is easy to press the gums and cause pain when eating. There are many reasons for toothache, so it is recommended to have a consultation to identify the cause of the toothache and then carry out targeted treatment.