牙髓炎是细菌或毒素侵入位于牙齿中心的牙髓引起的炎症。当牙髓发炎时,血管充血、扩张,会渗出很多液体,根尖孔又小,渗出的液体不能及时引流出去,使牙髓腔内压力增高,由于4周都是坚硬的牙体组织,压力无法扩张,神经末梢受到压迫,产生剧烈的疼痛,这在成人患者表现极为明显, Pulpitis is a bacterial or toxin that invades the pulp-caused inflammation of the teeth. When the pulp inflammation, vascular congestion, expansion, will seep a lot of liquid, apical hole and small, exudate liquid can not be drained in time, so that the pressure inside the pulp cavity increased, as 4 weeks are hard tooth tissue , The pressure can not be expanded, the nerve endings are oppressed, resulting in severe pain, which is extremely obvious in adult patients,