Porcelain teeth that are well bonded and maintained are generally not prone to decay. Porcelain teeth are mainly affected by three factors: the condition of the tooth itself, the maintenance situation and the condition of the restoration. 1. Not easy to fall off: most of the porcelain teeth are not easy to fall off, because the porcelain teeth are usually fixed on the teeth with professional adhesive, with a certain degree of solidity, usually will not fall off. 2. The condition of the teeth themselves: poor dental conditions, such as too small, too short, tapered crowns or insufficient residual tooth tissue, may lead to insufficient retention of the metal porcelain teeth and easy to fall off. 3. Maintenance condition: If you don’t pay attention to the protection of your teeth, eat hard or very sticky food, and don’t pay attention to the oral hygiene, it may lead to the easy loosening and dislodging of the porcelain teeth. 4. Restoration situation: It mainly involves the design, manufacture and bonding of the restoration. For example, insufficient tightness between the metal porcelain crown and the tooth or unreasonable bonding system may also easily cause the metal porcelain tooth to fall off. When it is found that falling out occurs after pressing a porcelain tooth, there is discomfort such as toothache or other physical discomfort, you should go to the hospital in time.