What are the specific aspects of the hazards of porcelain teeth?

Hello, the main disadvantage of porcelain teeth is that the edge of the circle of the line and the teeth is a hard link, there is no physiological dynamics, it is impossible to get rid of the food from the self, so the production of a close fit is the first and foremost, and secondly, it is necessary to specify the indications, should not be done to do porcelain crowns must not be done, here the first culprit is the use of porcelain crowns to change the tooth protrudes forward, which results in the teeth themselves change the physiological curve, resulting in the interruption of stress, the teeth are very easy to fracture. It is very easy to break.