Eating toothache may be caused by food irritation, hidden cracks, periapical periodontitis, caries and other reasons. 1. Food irritation: People whose teeth are sensitive will experience toothache if they consume too hot or too cold food while eating. You can try to eat some mild and non-irritating food in your daily life to avoid toothache. 2. Hidden tooth crack: It is a small crack that extends from the crown of the tooth to the root of the tooth, and there will be severe pain when you use the cracked tooth when you eat. 3. Periapical periodontitis: an inflammatory disease of the tissues surrounding the root tip of the tooth, which can cause severe pain when eating due to the stimulation of chewing. 4. Dental caries: the surface of the tooth has a cavity, food falls in when eating, stimulation of the pulp will lead to eating toothache phenomenon. Eating toothache patients are recommended to go to the regular stomatology department for examination, to clarify the cause of the disease after targeted treatment.