牙齿过敏是中老年人常见的一种口腔疾病,而这难以言状的酸痛,往往是由于刷牙不当等习惯引起的。人牙齿的牙冠最外面包裹着一层坚硬致密的组织,即牙釉质。牙釉质内部是坚硬程度稍逊的牙本质。牙本质内又包含神经、血管等软组织,统称为牙髓。牙本质的结构并不致密,其中有密密麻麻的牙本质小管,小管内充满了组织液,并与牙髓的组织液相通。在牙釉质的保护 Tooth allergy is a common oral and middle-aged oral diseases, which unspeakable soreness, often caused by improper brushing and other habits. The crown of human teeth is covered with a layer of hard and dense tissue, enamel. Enamel interior is less rigid dentin. Dentin contains nerve, blood vessels and other soft tissue, collectively referred to as pulp. The structure of dentin is not dense, which has a dense dentinal tubules, tubules filled with tissue fluid, and pulp tissue fluid communication. Protection in enamel