Why are teeth allergic?

In fact, tooth allergy has a certain relationship with the structure of teeth. Normally, it is an aging change, because the feeling of teeth is through the nerve of dental pulp, nerve endings, and even through the dentinal tubule touching the surface of dentin of teeth. The temperature and pressure changes, and the age will change with age. The teeth will show wear and tear, so that the protective layer of tooth surface will be worn away relatively, and its protective effect will be reduced. This can cause a certain degree of tooth weakness, there is also dental caries will also cause tooth weakness.