我们知道,人的上下牙齿分为前牙和后牙,而后牙都有两个或两个以上的牙尖。牙齿在发育过程中牙尖与牙尖愈合时,残留下一些坑窝和缝隙,通常叫窝沟,肝以窝沟都发生在后牙的咀嚼面。窝沟是后牙在发育过程中留下的生理缺陷,这一缺陷便给我们带来了许多麻烦。由于窝沟缺乏自洁作用,在咀嚼压力的作用下,食物残屑压入其中,用漱口、刷牙的办法都不能使窝沟得 We know that the upper and lower teeth are divided into front teeth and posterior teeth, and teeth have two or more cuspids. Dental teeth in the tooth during development and healing of the cusp, leaving some pit and gap, usually called fissure, liver fissure occurs in the chewing surface of the posterior teeth. Pit and fissure is a physical defect left in the developing process of the posterior teeth. This defect brings us a lot of troubles. Due to the lack of self-cleaning pit fissure role, under the action of chewing pressure, food debris pressed into them, with gargle, brushing the teeth can not make the pit fissure