It may be caused by a lot of diseases, if periodontosis of dental caries, acute, urgent chronic root is pointed Zhou Yan, periodontosis, tooth is substaintial allergic, tooth is folded crack etc.

• 它可能由许多疾病引起，如龋齿、急性牙周炎、急慢性根尖周炎、牙周炎、牙本质过敏、牙齿折裂等。