Eating bread toothache may be related to caries, periodontitis, cryptic cracks and other oral diseases. It is recommended that the patient go to the hospital in time to clarify the cause of the disease and treat the cause. 1. Caries: also known as insect teeth, tooth decay. When the affected teeth encounter hot and cold stimuli or food blockage, patients will experience sensitivity symptoms or toothache. It is often manifested as brownish-yellow, chalky or blackish-brown color of the lesion area, and cavities of different sizes may also appear. 2. Periodontitis: a chronic infectious disease of the periodontal tissues caused by plaque biofilm. The gums will be bright red or dark red with a soft texture. Patients will experience discomfort or pain when chewing food, or even acute periodontal abscess. 3. Hidden cracks: mainly due to factors such as excessive occlusal stress caused by the surface of the teeth appeared small cracks, serious cases will lead to the teeth are almost divided into two parts, this time by the biting force will lead to pain. There are many reasons why eating bread causes toothache, and it is recommended that patients go to the hospital in time. The cause of the disease will be clarified, and the treatment will be directed to the cause.