Eating toothache may have the following reasons: 1.Toothache caused by tooth decay, when the tooth decay is deeper, eating embedded into the cavity, it is easy to cause the phenomenon of pressure on the nerve, then the symptom of eating toothache will appear. It is also possible that the gingival papillitis will be caused by the pressure on the gum when eating, and the toothache will also appear. 2.Eating toothache may be caused by the hidden fracture of the tooth, and it is easy to produce pain when eating, it is recommended to grind out the hidden fracture part and carry out filling treatment, if necessary, it may be necessary to do porcelain braces repair. 3.Eating toothache may be caused by the tooth sensitivity, generally it is hot and cold irritation sensitivity. When the teeth are heavily worn or have wedge-shaped defects, they should be filled in a timely manner, and if necessary, porcelain braces should be done. It is also possible that the toothache is caused by a split tooth, so it is recommended to take an X-ray to check the extent of the split.