All-ceramic veneers are theoretically a permanent restoration, as long as they are not broken, they do not need to be replaced, because they are affected by more reasons, the use of time can not be generalized. Due to the use of all-ceramic veneer material is generally porcelain or cast porcelain material, this material itself is brittle, veneer is thin, only a thin layer on top of the teeth, there are limitations to the strength, such as clinical operations are not more standardized, veneers and teeth are not more close, bonding improper use of bonding agent, will result in the veneer and the teeth are not close enough to be more prone to fall off or bite, time will not last long. Therefore, not every patient can use veneers, the doctor will conduct an oral examination, such as the bite is too tight or the surface of the teeth bonding area is not enough, are not necessarily use veneers. When the indications are correctly selected, the clinical practice is strictly followed, and the patient is very careful in the use of veneers, they are a permanent restoration and do not need to be replaced. Patients just finished porcelain veneers, try not to eat darker food or drink, such as strong tea, coffee, etc., to avoid pigmentation, affecting the effect of porcelain veneers. Usually pay attention to not use porcelain veneers teeth to gnaw on hard food, such as bone, melon seeds, etc., to prevent porcelain veneers fall off and cracked.