经常有些中老年朋友问我:每当吃过硬和冷、热、酸、甜食物时,总有些牙齿产生难以忍受的酸痛感,甚至不敢咀嚼,非常苦恼。这是为什么?其实这就是口腔科的常见病“牙本质过敏”,俗称牙齿过敏。要了解牙本质过敏,首先要了解牙齿的解剖和组织结构,每个牙都是由牙冠、牙颈和牙根三部分组成。牙冠的最外层是半透明白色的,高度钙化的坚硬的牙釉质;牙根表层覆盖着色泽较黄的硬组织为牙骨质;而在牙釉质和牙骨质的内层,即是构成牙齿的主质称为牙本质,其硬度较牙釉质低,颜色呈黄色。在牙本质的内层有一空腔称为髓腔。髓腔内充满蜂窝组织,内含血管、神经和淋巴。每当牙冠、牙颈部表层的牙釉质重度磨损后,其部分牙本质即暴露于口腔。有的学者认为在牙本质内的牙本质小管中有神经纤维, Often middle-aged and elderly friends ask me: Every time I eat hard and cold, hot, sour, sweet food, there are always some teeth produce unbearable soreness, or even dare to chew, very distressed. This is why? In fact, this is the common disease of dentistry, “dentin allergy,” commonly known as dental allergy. To understand the dentin allergy, we must first understand the anatomy and organization of teeth, each tooth is composed of the crown, the neck and the root of the root. The crown of the outermost layer is translucent white, highly calcified hard enamel; root surface covered with yellowish yellow hard tissue for the cementum; and in the enamel and cementum of the inner layer, that is, constitute The main body of the tooth is called dentin, which is harder than enamel and yellow in color. In the inner dentin cavity has a cavity called the medullary cavity. The marrow cavity is full of cellular tissue, containing blood vessels, nerves and lymph. Whenever the tooth crown, the surface of the dental neck enamel severe wear, some of its dentin that is exposed to the mouth. Some scholars believe that there are nerve fibers in dentinal tubules in dentin,