Tooth pain when eating sweet may be caused by dental caries, cryptic fissure, periodontitis, wedge-shaped defects, etc. 1. Dental caries: when dental caries, the decay of the teeth reaches the dentin, and there will be pain when you eat sweet and sour food. 2. Cracked teeth: Cracked teeth can cause pain when eating sweets, sensitivity to hot and cold stimuli, and in severe cases, bite pain. 3. Periodontitis: Chronic periodontitis can lead to alveolar bone resorption and gum recession, which can further lead to the exposure of the tooth root, resulting in pain when eating sweets. 4. Wedge-shaped defects: horizontal brushing or brushing with too much force can lead to wedge-shaped defects in the neck of the teeth, which can make the teeth painful to eat sweets. If you have tooth pain from eating sweet food, go to the hospital in time to see a doctor and get a clear cause of the problem, so that the tooth can be restored to normal.