Tooth tenderness can be caused by wedge-shaped chipped teeth, root exposure, or cryptic fracture, and dentin tubule exposure causes tooth sensitivity tooth tenderness. 1. Wedge-shaped defects. When brushing incorrectly, long-term horizontal brushing can lead to cervical wedge-shaped defects, dentin exposure caused by dentin sensitivity, sweet and sour food or mechanical stimulation of self-consciousness and pain. 2. Root exposure. When tartar accumulates in the neck of the tooth for a long time, it can cause periodontitis, attachment loss of alveolar bone resorption, gums gradually shrinkage can cause root exposure, cold, hot, sweet and sour sensitivity to the outside world, biting weakness. 3. Cracked teeth. Teeth bite hard objects or chewing hard food for a long time, can cause hidden cracks in the teeth, hidden crack line up to the dentin layer, there can also be dentin sensitivity, the teeth may not dare to bite, bite weakness, teeth acid and other symptoms. Teeth softness may be dental or periodontal disease, specific need to go to the hospital to confirm the examination.